AstraAndromeda

Pressing 'R' I think? XD I can't check since I deleted my save where I was building stuff.

You need a saw to build stuff, (Right click anywhere when you have it in your main inventory to bring up the menu) and nails.. I think it's 4 planks and 4 nails to build a wall. Could be 3 though.

You guys work so fast! I'm gonna play this all night now. Thank you!

Yeah, will depend on who I'm playing with, I can't wait to group up with a few friends and see how long we can last for. xD