Rope and sticks as a third hand? No way that actually holds weird angles. I'd be terrified it would fall apart.

Just let your work speak for itself.

We got stuck waiting for a specialty junction box on a solar install once. The crew was just sitting there. My boss had us build a temporary outdoor enclosure from plywood and a heavy tarp to house the connections. It passed inspection as a temporary fix, and we could mount all the panels on schedule. It looked rough, but it got the job done until the real part showed up two months later.