Here's the pics I took while I was making it. As I remember it I built up the enclosure almost entirely from the inside. I didn't add much material to the outside of it. Too much material outside would have ruined the contour and fit. I only added outside what was needed to build up suspect areas. Also most of the building up between the frame and fiberglass was done underneath the frame.
One thing to note if you're going to do this is to use light coats. Gravity will have the liquid resin pooling at the bottom. That's the reason I laid it out in the sun between coats. I'm not sure if sunlight and heat sped up the curing process or not...in my mind it did anyway.
When I was making the dimension of the box match the volume of packing peanuts I had the long frame posts cut the length of the well and marked where to put the non-fixed end. Once it was in place I used the contoured cardboard for a temporary end. I taped that in place. Once I was able to pull the whole box out of the well I used a dremel to cut and sand the cardboard away as it was no longer needed.
Here's the pics of semi-finished box
If a mod feels the need to move the sub enclosure stuff to a new thread that would be understandable.