Construction issues

trying to create metal bars for a small structure that can still be shot through… i put down wood floor (because the metal bars say they need a ‘floor’) but i still cant build it. does it need a wall next to it as well, as seen in like, gun shops?

“Known” bug, see here:

You can work around this for now by constructing and deconstructing a door frame, leaving a floor behind.

ah~ for now i just went with chain link fence, cause it was a temporary defense kinda thing anyway (against big stompy boys… but temporary still.)