I guess i'll answer your PM here....
I used 3/4" melamine panels for my whole build. These panels are available at Home Depot. Already have a white washable finish and come in 2' x 8' panels.
Water system is all available at a camper parts store.
32 gallon fresh water, 40 gallon waste water, 2.8 GPM water pump and a couple 4 gallon hot water tanks. 1 for hand wash and 1 for 3 bay sink.
If you have any plans to vend and aquire a permit, you MUST submit a plan review to your local HD BEFORE you do any build. Don't waste your time putting something together and hope they'll approve it.
Good luck and keep the questions coming!
Pitboss @ Woodpile BBQ Shack
I cook the best brisket north of Dallas. Get over it.
Michigan State Lead-Operation BBQ Relief
BBQ Person of the Year 2013