Made a few changes..

.gitignore

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+*.pyc
+__pycache__
+.env
+.vscode/*
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+*.code-workspace

Builders/BodyBlankBuilder.py

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+import os, sys
+import adsk.core, adsk.fusion, adsk.cam, traceback, math
+from math import sqrt
+from ..ParameterValues import ParameterValues
+
+class BodyBlankBuilder:
+
+    def __init__(self, app):
+        self.app = app
+        self.design = app.activeProduct
+
+    def buildBodyBlank(self, parameters: ParameterValues):
+        rootComp = self.design.rootComponent
+        allOccs = rootComp.occurrences
+        blanksOcc = allOccs.addNewComponent(adsk.core.Matrix3D.create())
+
+        blanksComp = adsk.fusion.Component.cast(blanksOcc.component)
+
+        bodyLength = parameters.bodyLength
+        bodyWidth = parameters.bodyWidth
+        bodyThickness = parameters.bodyThickness
+        headstockLength = parameters.headstockLength
+        headstockWidth = parameters.headstockWidth
+        headstockThickness = parameters.headstockThickness
+        guitarLength = parameters.guitarLength        
+
+        # Create a new sketch.
+        sketches = blanksComp.sketches
+        xzPlane = blanksComp.xYConstructionPlane
+
+        #Get extrude features
+        extrudes = blanksComp.features.extrudeFeatures
+
+        #Create sketch for bridge spacing
+        sketch1 = sketches.add(xzPlane)
+        sketch1.isComputeDeferred = False
+        sketch1.name = 'Body Blank'
+        bodyBlankSketch = sketch1.sketchCurves.sketchLines
+        bodyBlank = bodyBlankSketch.addTwoPointRectangle(adsk.core.Point3D.create(0, -bodyWidth/2, 0), adsk.core.Point3D.create(bodyLength, bodyWidth/2, 0))
+
+        #Create sketch for bridge spacing
+        sketch2 = sketches.add(xzPlane)
+        sketch2.isComputeDeferred = False
+        sketch2.name = 'Headstock Blank'
+        headstockBlankSketch = sketch2.sketchCurves.sketchLines
+        headstockBlank = headstockBlankSketch.addTwoPointRectangle(adsk.core.Point3D.create(guitarLength-headstockLength, -headstockWidth/2, 0), adsk.core.Point3D.create(guitarLength, headstockWidth/2, 0))
+
+        #Get extrude features
+        extrudes = blanksComp.features.extrudeFeatures
+        bodyProf = sketch1.profiles.item(0)
+        headstockProf = sketch2.profiles.item(0)
+        bodyExtrude = extrudes.addSimple(bodyProf, adsk.core.ValueInput.createByReal(-bodyThickness), adsk.fusion.FeatureOperations.NewBodyFeatureOperation)
+
+        # Get the extrusion body
+        bodyBody = bodyExtrude.bodies.item(0)
+        bodyExtrude.name = "Extrusion: Body Blank"
+        bodyBody.name = "Body Blank"
+        headstockExtrude = extrudes.addSimple(headstockProf, adsk.core.ValueInput.createByReal(-headstockThickness), adsk.fusion.FeatureOperations.NewBodyFeatureOperation)
+
+        # Get the extrusion body
+        headstockBody = headstockExtrude.bodies.item(0)
+        headstockExtrude.name = "Extrusion: Headstock Blank"
+        headstockBody.name = "Headstock Blank"
+
+        # Get a reference to an appearance in the library.
+        lib = self.app.materialLibraries.itemByName('Fusion 360 Appearance Library')
+        libAppear1 = lib.appearances.itemByName('Wax (White)')
+        blanksAppearance1 = blanksComp.bRepBodies.item(0)
+        blanksAppearance1.appearance = libAppear1
+        blanksAppearance2 = blanksComp.bRepBodies.item(1)
+        blanksAppearance2.appearance = libAppear1
+
+        #Centers the camera to fit the entire fretboard
+        cam = self.app.activeViewport.camera
+        cam.isFitView = True
+        cam.isSmoothTransition = False
+        self.app.activeViewport.camera = cam
+
+        # Group everything used to create the fretboard in the timeline.
+        timelineGroupsBlanks = self.design.timeline.timelineGroups
+        blanksOccIndex = blanksOcc.timelineObject.index
+        blanksEndIndex = headstockExtrude.timelineObject.index
+        timelineGroupBlanks = timelineGroupsBlanks.add(blanksOccIndex, blanksEndIndex)
+        timelineGroupBlanks.name = 'Blanks'
+        blanksComp.name = 'Blanks'
+
+        return blanksComp