If you must build a sideways rack as you describe then go ahead, or buy my 12 tub one I am currently using for cheap, but I'll warn you...IT WILL WARP!! The shelve are too wide not to sag in a sideways rack over time. Mine is not warped really bad, but bad enough that I'd never build one like it again. Deep only from here on out on 41qts for me (which is the way I discussed with you via pm). You can build a 5 tub deep rack with 2 sheets of melamine, not a 6. You can build a sideways 7 tub with 2 sheets. Go which ever way you like, but I'd reconsider building a sideways one. I would be happy to give you an exact cut list of mine if I haven't talked you out of it yet, just pm me again.