Jefe:
Always a good write up - as others I have seen on the internet from you. The blue Dow insulation/foam product you are using is indeed difficult to source. (Dow Styrofoam Blue Board rigid XPS insulation) I am wondering if anyone has experience with what might be an alternative available at HomeDepot.
Picture from Jefe's writeup
Here is a link to the "Pink stuff" at HomeDepot (FOAMULAR NGX F-250)
Ford Super Duty's are notorious for their tall bed floor to cab roof dimensions and it is common to have to raise a slide in to fit these trucks properly. I've used 1-1/2" pink XPS with an 1/8" sheet of Luan laminated to the top for years in our Super Duty without issue. Then I got a real truck and haven't worried about it since...
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