go buy a gallon of Fiberglass resin. It will have two little tubes of hardener on top. Pour the resin into the top plastic part (you'll understand once you get a gallon). Put a small squeedge of the tube of hardener in (the two tubes have to last you for a gallon... so think about how much you need to use). Mix it up. It will start to get hard in 10 or so minutes.
Now, you should have your fleece put on the case by now and all ready to go. I'm not whoring out my thread - but look through it, and you can see the construction pics and when the fleece was layed out etc.
http://www.explorerforum.com/forums/showthread.php?t=102495
Then use a paint brush you dont care about and 'paint' the resin all over the fleece. Fleece absorbs a LOT of resin. Each of the little plastic bowls will be roughly enough resin for an area 3x the size of the bowl. Dont use it sparingly. Leave it be for an hour or so. Then flip whatever you're building over and paint the inside of the fleece with more resin. Wait another hour. Now you have your shell.
Keep the box you're building flipped over. Buy some fiberglass mat. Paint a very thin layer of resin on the backside of the area you just did... Then take the fiberglass mat and dunk it into the resin. Make sure it all gets 'wet'. Then lay the mat all over the back of the structure. Do 2-5 layers of this.
Now just bondo up the front side of it, sand it and paint. You're done. Oh, buy plastic surgeons gloves, and wear crappy clothes... the resin will get EVERYWHERE.
sounds easy, but also
very very easy to mess up. I'll testify that I've probably had to put in an extra 10-15 or so hours into my box because of things I messed up on. If you've never done it before, I'm not sure I'd tackle this project by yourself... either ask someone who knows about it, to come over and help or pay someone to do it the first time and learn from them. Just my $.02 though
I'll take some pics this weekend of the process if you want.