I am actually still having issues spawning them. It could be a mod compatibility issue. Although the other Vehicle Framework mods are still working. (So this very well can be a me problem.)
I am unable to build the vehicle. I am attempting in "god mode" with no success. It won't even make a clicking noise or put the ghost structure down. All my pawns are capable of building this and I have the necessary resources as well. I attempted to build in a home area that was clear of obstruction. The vehicle's ghost is green, indicating that it is able to place there. The area I attempted to build was on solid ground. Oh and this occurred for both mods.