A weapons/vehicle maker, INGAME

[Space Guy]

For the vehicles one, hide node areas of a base with fake "bricks" or parts on top of it and retransmit datablocks should work.

I'm not saying this is a good idea or very 'lag free'. It could easily be spammed to go over the datablock limits if you keep changing the speed/settings of it.

[Ad Bot]

[HellsHero]

Or maybe the vehicles would not be made in-game just in the main menu screen.

There would be a button that would say "Make A Vehicle". Then you click it and a pop up screen would appear, and there would be pre-made things that you can put together to make a vehicle. You could also set were people sit and you would place were the mounted gun(s) would go (if there would be any), and if there would be movable parts like V9's Tank.

[Mikery]

You could maybe make your own vehicle maker just make a moving platform with chairs.