I simply marked out the grid and then filled in the blanks. The hashed areas are where the 'block's, or walls, will go. I up-scaled the board a little, so that getting the 40mm DS based figures in and out of the terrain wouldn't be a problem.
I managed to get the second board done, so here's the two individual boards joined together.
|Incursion 3D Play Set: Both boards in planning stage. Miniature for scale.|
I also started downloading some graphics ready to use on the interior. Such as this. It'd be rude not to.