I like that sherpa offers the feet separately. Did the feet come with the hardware to connect to the roof? Did you buy the rubber spacer?This is my diy 8020/extrusion rack:
SherpaEquipmentCo “Quandary” feet
Various tnutz/8020 parts
Uses 1x1” as the outer frame, then 2x1” crossbars
Crossbars attach to outer frame via these brackets that go on the end of the crossbars (EFD-010-1/4-20) Double End Fastener Assembly | TNUTZ | TNUTZ
The outer 1x1 has drilled access holes to tighten the button head M6 machine screws on the ends of the crossbars
Also added some slot covers all around
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