Once they have about 1.5 inches foam, they mark and stick hangers in place for the rebar.

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These pictures give you a better perspective of the arch heights between domes. I used some if the PEX tubing and a 55 gallon drums to make hot water heater tanks.
I had them foamed and later I will hook them up to the solar collectors. Next they apply more foam, securing the rebar hangers. Then Murphy showed up... The foam machine started leaking,
He said it was just an O ring, and he could fix it in half an hour.
They should be on to the rebar next week.