Update..
Today we finished up a couple braces and cut the box. The frp and aluminum were real simple to cut without having to worry about pinching ,but the floor is another story. The I beam must have had a bow in it and been under tension cause it closed down like a clam as soon as we got to the ends. One thing we did not see coming is as soon as you cut the front panel the box starts swaying pretty easily.. So any bracing should be done prior to this..
We ended up keeping the front panel and aluminum corners together to reattach to the origanl c channel pushed back to the new edge. trimmed the floor to match and rewelded in place. Made good progress hoping to get it closed back in next weekend. What kind of fasteners are people using to attach frp to the bottom of the attic frames ?
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