I don't think there will be any way to port Roblox models/blocks over to the Torque3D Engine, so it would have to be replicated with all new terrain.
Yeah, using the ingame Editor and stuff, I bet someone can, but the buildings would have to be custom made, and a lot of the areas. Also, if I were imagining it, I couldn't really imagine any UD map in BeamNG Drive since it wouldn't have that 'blocky' charm every game has...