You know surrounded by gymnastics places...? They have the pits near the foam blocks. Well I have a...

They have the pits near the foam blocks. Well I have a room upstairs and I want a pit within my room.I can get the blocks but i cannot spawn a cut in my floor. I be thinking of like getting a big box that I can sit within to put in the foam blocks but where on earth could I get a box thats big and something thats not cardboard. Kindof close to a jacuzzi but not expensive or anything? If so could I make one and how would I engineer it and what material would I use?
What should i put on the walls?
Answers:    try this website for information on how to build a box and correct luck!

http://www.newwoodworker.com/basic/build...