Do you want it to be functional? Or just a decoration? Also, is it for a custom house, or something like a keep, castle, etc?
If it's in a custom house and you just want it as deco, it would probably be pretty easy. There are a couple tile sets that look good as bridge type things to start with, for example. If you want something functional though, I dunno about that. I just kinda came back to the game myself after a couple years and have been getting familiar with all the new stuff again.