I think I can built the cabinet out of square stock aluminum with snap in connectors and a few bolts. I'm all for a company making money but $346.69 plus shipping from Washington State for just an aluminum frame is a little much IMHO. I can even order the aluminum stock with wings on it to slide the egg trays on.
I would weld but I have no experience in welding. Could also hire someone to weld it but with the snap ins and a few bolts there is no need.
By building the cabinet I can just order the egg trays. I actually think I only need one judging by the low number of eggs I hatch.