i would like to make a fiberglass box that would fit into the spare tire well. ive read about how to make fiberglass boxes and it seems relatively simple and my father has worked with fiberglass for years. Has anyone tried this before it seems like it would be a great setup and save a lot of trunk space. i would want to mount a 12 inch sub and have the box ported. the sub id want would need around 1.5-2.00 cubic feet for ported and 1 cubic foot sealed. do you think that this idea is a possibility?