Thanks for the reply-Answered your questions below

-Could you build and sell them for a price comparable to other racks on the market? YES
-Do you have a reliable source of building materiels, and how much would you need to buy for a quantity discount? YES, and if demand warranted it, I would just buy from the manufacturer for a substantial savings over current pricing.
-Do you have the time or desire to build a bunch of them if the racks start selling well? Yes, and I like to make jigs for things so I can actually put together a rack very quickly.

My main concern right now is making them easy to break down and re-assemble for the potential customers.