Home Depot usually carries Melamine panels in different sizes...plus you can cut them down and use the "iron-on" Melamine edge banding kit for a neat...
The plastic drawer tower for the processing sequence is not a good idea. Have you ever actually FOUND a set of those towers that functioned correctly...
As others have said, scouring Marketplace and Craigslist (or its local equivalent) is going to be the best way to get started with an enlarger, etc....