Just completed building my rear interior sleeping platform and rear storage rack. Total cost to build less than $30.For the sleeping platform I got the 3/4” Treated 8x4 Plywood free, free cushioning and spent $27.98 at Lowe’s for the platform covering. To build the storage rack I cut up angle iron from an old food kitchen shelf which happen to have preslotted holes. I got the 1/2” plywood free, free cushioning, free covering and spent $1.60 for 4 bolts at the hardware store. Anyone have ideas about a DIY overhead radio mount system or rifle rack?