Fiberglassing on a Budget, Please Help.

I've tried to read as much as I can about fiberglassing in the past couple of weeks, but I'm still a little scared to go ahead and start my project. I'm on a very tight budget, as I am trying to save all the money I can for my engine and suspension right now. Just for the record, I'm trying to build a fiberglass enclosure in my spare tire well for a single 10" sub. So far I have purchased the following:

All the MDF I will need
Bondo No. 488 Fiberglass Mat 75dm2 - Two Packages
Bondo No. 499 Fiberglass Cloth 75dm2 - Two Packages
Bondo Polyester Fiberglass Resin With Hardener - 32 FL OZ (946mL)

All of these items, excluding the MDF, cost about $40 Canadian at Walmart. Just so you know, I'm NOT looking for a show finish. I'm just looking to free up the space in my hatch area. So, down to the questions.

I read somewhere that you can use old t-shirts and stuff like that instead of fiberglass mat/cloth (can't remember which). I can't find the site I read this at, so does anybody know what kind of material the shirts have to be made out of in order for me to be able to use them? If I can use those t-shirts instead of the cloth or something then I'll just return the cloth/mat and get my money back.

And my second question is, what order do I lay everything down in? Do I go:

Removable layer (tin foil with pam or something) - Resin - Fiberglass mat - remove from well - resin - fiberglass cloth
OR
Removable layer - Resin - fiberglass cloth - remove from well - resin - fiberglass mat

?

Any DETAILED websites would also help, thanks guys.

Thanks myearshurt. Maybe I'll have pics of mine by then as well to add to your new thread. I saw what happened to your window when you first posted the thread about it.. that sucks

I think I'm ready to do it this weekend, weather permitting since I'll be doing it outside. I'll post back if I have more questions, or pics and stuff. thanks guys.