My 1970 GMC “Project Splice”

[Kronald_70GMC]

I'm hoping that someone who has installed vintage air might be able to chime in on this. Im still trying to figure out how I can mount the unit as clean as possible but I can't afford the unit as of yet. I would like to have the fasteners hidden from the engine bay to stick with my clean firewall theme. So my question is, if I were to weld in two vertical channels on the inner firewall that were just wider that the overall unit, would I then be able to build a mounting plate that I could bolt to the unit, and then to the channels? Im fairly sure that it would work, my only concern is that I would be then mounting the unit, Im guessing around 3/4" further into the cab. Does anyone know if this would work? Thanks in advance for any help on this.