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Thingol - Thank you, that's very helpful feedback. I've watched video from the Sunpal website showing their assembly which seems very human labor intensive with potential for error. However the price is so attractive it makes me want to smash some buy buttons =) Edit: new SunPal video I...

How have the Sunpal Panels worked out? Do they perform to spec? Any failure manufacturing issues? Thank you

This appears to be a version of "perfect wall" (roof, & foundation), from Joseph Lstiburek https://www.buildingscience.com/documents/insights/bsi-001-the-perfect-wall