About a month ago, I even tried to see if I could get the cost down by using the polymer like a steel reinforced composite (like reinforced Concrete). Either like prestressed concrete or normal rebar reinforced (threaded rod would act as gradual load transfer mechanism in lieu of deformed bar). Even this configuration couldn’t match the cost of steel or aluminum framing for strength and cost. So, the decision is steel framing and I’ll figure out how to get it mig welded.