Map of the US&A with elevations visualized. I think I found the original from an online Topology generator. I've cut this one into 4 chunks that can fit on the MK3's Bed and also thinned it so it can be a wall piece.
It's printed in 4 chunks of the county. I just applied a very liberal amount of super glue to hold all 4 sections together. the West coast has a lot of elevation to hold those two halves together. the east coast was a little more tricky as its rather flat. 3 or 4 rounnds of gap filling super glue seems to have them pretty well together though.
The author hasn't provided the model origin yet.