I rented space in a 250,000 sq ft warehouse, and made an enclosure with pallet racks. It worked well. You will need to add shelving to add stability to the uprights - at least two shelves. Shelves come in a variety of lengths.
I used self tapping screws to attach drywall to the outside of my space. You could easily screw OSB to make walls.
If you put a shelf at 36", it makes for a bomb proof bench. Put another one just above your head, and you can attack lights to the bottom of it (over the bench) and have massive storage above the bench. Each shelf is rated to 1,000 or 1,500 pounds.
I'd make sure the posts are level & plumb - and sitting on a really stable base. Bolt them down if possible.
In short - go for it.
