Molding in a Wide Body Kit

I was wondering how to mold in a Wide Body Kit.  I already have the kit.  It was for a 1997 Eclipse, and looks like a NSX.  I am going to put it on an Avenger though.  I test fitted it yesterday and the door panels fit perfect, but the rear panel does not fit that well.  The panel is 3 inches shorter in width, but the height is perfect.  For the 3 inch gap, I was planning on using the wide body itself as a mold (with some help of foil) and mold the mold I made to the kit.

I was talking to a friend here that did his wide body on his Civic, and he said to:

1: Rivet it on (if fits okay).

2: Sand down the whole car after riveting it on because you don't want to waste time sanding down parts that are going to be covered by the wide body kit.

3: After sanding, fiberglass it on with 2-3 layers, and sand it down smooth.

4: Primimer and wetsand.

5: Paint.

Is this the correct method?

Here is a picture of the kit.  This kit is made to go on a car already with a full body kit, so that is why there is now bumpers or side skirts.

and the car it is going on:

I hope you're not talking about moulding the kit to the car to fill all the seams that a regular kit would have, between the bumper and the fender for example.. if this is the case I hope the car will not be driven, but only loaded on a trailer and unloaded at the show, becaseu otherwise the kit will crack, right along where the seam would have been..... just a thought, if thats the direction you are going.

The Saint

No, I was going for instructions.  And the person putting the kit on, has one on his car, and is a daily driver.  It is perfect, and has never cracked for the 3 years it has been on.

Also, I have never heard of someone NOT molding in a wide body kit.  It would look stupid if it wasn't.

2 weeks???  It took a shipping company to send on WIDE BODY KIT from Aug 5, and arrived on Aug 8.  Two business days.  My front bumper was 1 day, and my hood was 8 days (because it was damaged, and they sent another one).  Two weeks, something smells fishy....  I will be putting the door parts on TODAY!!