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Just glancing through the sight it seems like some things like his insulation strategy are a bit poorly though out.

Google around a bit on you'll see there is a lot of debate on how to deal with condensation to prevent rusting out the metal of your van. It isn't clear if he's intending his system to deal with this by creating a vapor barrier with all that spray foam or if he's just going to end up with a bunch of condensation trapped in the space between the foam and the metal leading to rust.

And reflextix isn't particularly useful between two layers where it isn't exposed to radiant heat to reflect so I think he just wasted a bunch of money sticking it under the foam.