Depending on the shape that you are trying to achieve you may be able to just get away with using template guides on the top and bottom of your block. The guides are cut into whatever irregular shape you want and your harp cutter runs on these much like a router bearing bit. After you have finished cutting one angle you would attach another set of templates over the first ones for your return cuts. May be worth the 90 bucks in materials to try this out to avoid the cost of the 3D model, and 3-Axis machine time.
If you have some illustrations I can run a quick mockup for you with some scrap blocks we have collecting dust.
Another consideration would be the permanency of the sculpture. Bugs & Birds love this stuff unless it is thouroughly coated and a large object might entice some climbing. There is a wide range of coatings & hardeners that can be used in and outside of the EPS for durability.
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