As to rules, I was thinking of converting the old Epic40k rules for use. Strike Legion also has a unit designer and plenty of rules, I was thinking of just using some custom mods for that as well.
I wrestle with the 3D design. To be honest, it is just heinously expensive. The sculpting itself is typically a bit more expensive, and the printing costs, for a legit printer are like 60-80% the cost of having them physically sculpted. For vehicles I don't mind so much, but the infantry, the printing costs are killer. So it makes it difficult when you have vehicles where you need to have crew included. Because I could get the creatures and mechanical portions CAD sculpted, but then I need to send some master casts to use as a template for the physical sculptor for the crew. It also then risks the line looking a bit off kilter, since there are mixed aesthetics.
I'll have to mull it over a bit more....
in the meantime, bugs!
The idea is to have these mastered so that the sculptor can sculpt the mechanical portion onto them, and it gives flexibility on variants. The big beetle is going to have to get modded a bit for castability. I'm also worried about the dragonfly leg holes, that because they are a little deep the mold might tear. Other than that though, they look spot on with the art, overall appearance should not change. I was thinking of getting 1 more mid-sized beetle done for variety.
Roach Rider test sculpt:
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Including its allied troops. 
Yeah, espacially the warbeasts could look amazing in traditional sculpting.
