diff --git a/src/bonsai/bonsai/bim/module/drawing/operator.py b/src/bonsai/bonsai/bim/module/drawing/operator.py
index 8c7ea0c65d..23198c60d7 100644
--- a/src/bonsai/bonsai/bim/module/drawing/operator.py
+++ b/src/bonsai/bonsai/bim/module/drawing/operator.py
@@ -313,16 +313,15 @@ class CreateDrawing(bpy.types.Operator):
                         # Reassign props as data is recreated during the update.
                         self.cprops = tool.Drawing.get_camera_props(self.camera)
 
-                    self.svg_writer = svgwriter.SvgWriter()
-                    self.svg_writer.human_scale = self.human_scale
-                    self.svg_writer.scale = self.scale
-                    self.svg_writer.camera = self.camera
-                    self.svg_writer.camera_width, self.svg_writer.camera_height = self.get_camera_dimensions()
-                    self.svg_writer.camera_projection = tuple(
-                        self.camera.matrix_world.to_quaternion() @ Vector((0, 0, -1))
+                    camera_dims = self.get_camera_dimensions()
+                    self.svg_writer = svgwriter.SvgWriter(
+                        camera_width=camera_dims[0],
+                        camera_height=camera_dims[1],
+                        camera=self.camera,
+                        camera_projection=(self.camera.matrix_world.to_quaternion() @ Vector((0, 0, -1))),
+                        scale=self.scale,
+                        human_scale=self.human_scale,
                     )
-                    self.svg_writer.calculate_scale()
-
                     self.svg_writer.setup_drawing_resource_paths(self.camera_element)
 
                 underlay_svg = None
@@ -358,8 +357,10 @@ class CreateDrawing(bpy.types.Operator):
             bpy.ops.bim.activate_drawing(drawing=original_drawing_id, should_view_from_camera=False)
         return {"FINISHED"}
 
-    def get_camera_dimensions(self):
+    def get_camera_dimensions(self) -> tuple[float, float]:
+        assert bpy.context.scene
         render = bpy.context.scene.render
+        assert isinstance(self.camera.data, bpy.types.Camera)
         if self.is_landscape(render):
             width = self.camera.data.ortho_scale
             height = width / render.resolution_x * render.resolution_y
diff --git a/src/bonsai/bonsai/bim/module/drawing/svgwriter.py b/src/bonsai/bonsai/bim/module/drawing/svgwriter.py
index 9b42b01c54..f372fdf60c 100644
--- a/src/bonsai/bonsai/bim/module/drawing/svgwriter.py
+++ b/src/bonsai/bonsai/bim/module/drawing/svgwriter.py
@@ -61,15 +61,28 @@ class External(svgwrite.container.Group):
 
 class SvgWriter:
     metadata: list[str]
+    resource_paths: dict[tool.Drawing.ResourceType, Union[str, None]]
 
-    def __init__(self):
+    def __init__(
+        self,
+        *,
+        camera_width: float,
+        camera_height: float,
+        camera: bpy.types.Object,
+        camera_projection: Vector,
+        scale: float = 1 / 100,  # 1:100
+        human_scale: str = "NTS",
+    ):
         self.data_dir = None
-        self.human_scale = "NTS"
+        self.human_scale = human_scale
         self.metadata = []
-        self.scale = 1 / 100  # 1:100
-        self.camera_width = None
-        self.camera_height = None
+        self.scale = scale
+        self.camera = camera
+        self.camera_width = camera_width
+        self.camera_height = camera_height
+        self.camera_projection = camera_projection
         self.resource_paths = {}
+        self.calculate_scale()
 
     def create_blank_svg(self, output_path: str) -> Self:
         self.calculate_scale()
@@ -93,7 +106,7 @@ class SvgWriter:
 
     def setup_drawing_resource_paths(self, element: ifcopenshell.entity_instance) -> None:
         pset = ifcopenshell.util.element.get_pset(element, "EPset_Drawing")
-        for resource in ("Stylesheet", "Markers", "Symbols", "Patterns", "ShadingStyles"):
+        for resource in tool.Drawing.RESOURCE_TYPES:
             resource_path = pset.get(resource)
             if not resource_path:
                 self.resource_paths[resource] = None
@@ -1085,7 +1098,7 @@ class SvgWriter:
         # When rewriting to use polylines, we should use this normal instead.
         # center = tool.Cad.get_center_of_arc([p.to_3d() for p in arc_points], None).to_2d()
         # normal = mathutils.geometry.normal([arc_end_pts[0], arc_end_pts[1], center])
-        # normal = Vector(self.camera_projection)
+        # normal = self.camera_projection
         # dir1 = (arc_end_pts[0] - center).normalized()
         # arc_mid_dir = (arc_end_pts[1] - center).normalized()
 
@@ -1462,9 +1475,9 @@ class SvgWriter:
         # TODO is this needlessly complex?
         return self.camera.matrix_world.inverted() @ geometry.intersect_line_plane(
             point.xyz,
-            point.xyz - Vector(self.camera_projection),
+            point.xyz - self.camera_projection,
             self.camera.location,
-            Vector(self.camera_projection),
+            self.camera_projection,
         )
 
     def get_spline_points(self, spline: bpy.types.Spline) -> Union[SplineBezierPoints, SplinePoints]:
diff --git a/src/bonsai/bonsai/tool/drawing.py b/src/bonsai/bonsai/tool/drawing.py
index 41f5ebc356..e6721ae53d 100644
--- a/src/bonsai/bonsai/tool/drawing.py
+++ b/src/bonsai/bonsai/tool/drawing.py
@@ -1285,6 +1285,9 @@ class Drawing(bonsai.core.tool.Drawing):
     def sanitise_filename(cls, name: str) -> str:
         return "".join(x for x in name if (x.isalnum() or x in "._- "))
 
+    ResourceType = Literal["Stylesheet", "Markers", "Symbols", "Patterns", "ShadingStyles"]
+    RESOURCE_TYPES = ("Stylesheet", "Markers", "Symbols", "Patterns", "ShadingStyles")
+
     @classmethod
     def get_default_drawing_resource_path(cls, resource: str) -> Union[str, None]:
         project = tool.Ifc.get().by_type("IfcProject")[0]