This was made using the method that you guys are talking about... Its a little choppy because it had to be built and painted within 2 days so my son could have it for Halloween. And yes, I know that its not accurate. 
The foam sheets were cut then glued using a foam glue from the craft store (just a thicker kind of Elmers white glue. Then, some of the detail strips were added using a thick poster board.
Yes, the polyester resin ate the foam, but I used white foam (like a big dummy). I've read that polyester resin won't eat the blue/pink foams because its not a styrene... Not sure if thats true or not, but its what I've read.
I actually added the layer of Bondo on top of the fiberglass to get it smooth without sanding holes in the fiberglass sheets. Probably not the right way to do it, but like I said, it was a super rushed job and I had absolutely no clue what I was doing.
Overall, I don't think it came out too bad for the amount of time that went into it. The only thing that I don't like about it is that its not symetrical (the right bottom corner is angled), but thats my fault for not looking at as a whole before I went to the finishing stages.
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