Neat to find a PB user here

Labor intensive for smooth edges, yeah, it's true- but it's a method designed for non-organic shapes. We are working to update that though! On the other hand, my friend with ZERO 3D experience was able to build all sorts of semi-complex stuff with the "box" method, it's great for early users. So simple, impossible to break, and very fast with ProGrids. When I showed her Extrude, edges, etc, she promptly broke everything, got frustrated, and when back to boxes...haha. It was an interesting case study
Back on the actual subject of this thread, we are starting to lean toward just a spiritual successor, without actually using the IP. Would prefer to have all options open, rather than limited by licensing. However, we will be keeping it very, very close to the original- can't copyright game mechanics!
On the other hand, that Eidos was willing to go GPL means there might be someone we can approach directly about the IP.