My idea of doing spray foam is to have someone pull the front cap and spray the backside (Front) of the closet. Then trim the foam so that the cap still fits. If you wanted to do a 2 part pour foam that is a low expansion, that too would work, but it's liable to be messy if it runs inside or out the bottom of the cap.
We used both spray foam and pour foam in the yacht business. Insulated live wells, freezers, walk in coolers, etc this way. I don't think having the front too ridged is an issue.
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A&J
2017 Mobile Suite Memphis
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