How about getting a large industrial plastic bag (a local factory may discard them) and using that to hold the frame and solution?

EDIT: The heavy bags that flat-screen TVs often come packed in should be ideal; perhaps a local electronics outlet discards them.

Or something like this, doubled, should do the job: Amazon.com: Clear Contractor Bags, Ruffies Pro, 3 mil, 42 Gallon (20 ct): Health & Personal Care

Two nice things about a bag over a tank are that you would not need too much solution and it is easy to agitate.