Old, hard-sided suitcase; find one at a flea market or on eBay (where some are as low as $10)
• Four table legs (available on homedepot.com)
• Four angled top plates and 16 screws (available on homedepot.com)
• Particleboard or MDF (cut to fit your suitcase)
Place the cut-out piece on top of a tall stool, then place the suitcase on top of the cutout. (This will push the board up against the bottom of the suitcase so you can drill the plates). Position a top plate in each corner of the suitcase and secure it to the case with screws long enough to go through the plate, the suitcase, and half the depth of the particleboard. Repeat for the other three plates.