I have no idea how it will work but it sounds interesting! Like a truss rod on a guitar neck. Any way to get a T in there for stiffness? Can you get double acting truss rods in an 80" format? Sounds like a rough environment as far as heat, is stave core an option? Too late if wood is already in the shop, and bid price already set. Poplar can be fickle, failure rate isn't too bad on that volume, my thinking is bump in a few extra doors during construction, put it in the price, better if there were some place on site to store them!
"A good miter set up is like yoga pants: it makes everyone's butts look good." Prashun Patel