I am trying to build my first bow, and its a three piece take down. I built my box 48 long aprox 18 heigh and about 14 wide. But it is all going to depend on what type of bow you are building,how tall and wide your form will be how big and what type of clamps or air hose you will use. If it was me I would build your form first so you know what size box you will need. Allow enough room in the lid or else where for the light bulbs( i was real close to not fitting in my box because I didnt take in to account the bulbs hanging down) Good luck