I'm doing 2 signs in HDU, both rather large (5'x3' and 6'x3½'). I pretty much know what to charge for the sign itself but. I have an element for the bigger one that I have never had to account for. I have to mount it on a steel frame that is hinged like a door as a vehicle charging station will be housed behind it. The metal is cheap but the design isn't..Any opinions out there? I rarely do metal fab. I like it though and want to do more but I'm not sure what to charge.