This is a big thanks to Laserfan for the shelf design, it really adds strenght to the rear and side walls. I just had a few questions for laserfan or anyone else that has input. The shelf unit is pretty straight forward but I can't really figure out how to handle the rear corner support for the shelves and how to tie them into the GH. One point of interest, here in York, PA it is very hard to find the pipe crosses used in the shelf (had to go to 3 supply houses) evidently they are not used much anymore. Also be prepared to add extra bolts in the wall studs ahead of time because its no fun doing it after the fact. Overall though this shelf unit gets a BIG THUMBS UP and anyone putting up this GH should really consider the addition. Incidently I secured the cross members and the shelf supports with "L" brackets and self tapping screws and it worked great, welding isn't in my skill set.