I guess you could use the CAD files that Teb linked and print out blueprints of each side then sculpt the foam? This will ofc rely on your sculpting skills.
You could also maybe try using foam crafting sheets and layer each segment of the marker points - building it up one block at a time fomr the bottom up. This would probably give the best results will less skill, but will be time consuming and require that you split the blueprint into each of these sections.