T56 magnum install 69 Cuda

We are looking into various shops to build these 2 parts. The torsion bar frame support and the transmission mount. It looks like these will need to sell around $700.00. I think we can get them down to about $600.00 if we get 10 or more, and can make a run of them.
Let me know what you guys think. Mine are made out of 1/4" carbon steel. I think 3/16 would be quite strong, but it really doesn't affect the price much. Please give me feedback so I can either bail out, or move forward. Thanks so much guys!!!! Todd