Removing all HVAC from 1972 GMC?

[Gigem]

My 1972 GMC had factory air, but the compressor is gone and I have no desire for HVAC. This is a fair weather only truck, and the simpler the better for me. No heat, no vent, no nothing.

The heater is already bypassed. The AC lines are already cut. As I said, the compressor is gone (was not installed on crate motor when we put it in).

My plan is to basically follow the "take it apart" portion of the instructions from Vintage Air, except I have no intention of draining the radiator.

I'll remove the drier and condenser, the big evaporator and blower thing on the firewall, the heater duct and hoses inside. I'll probably leave the vents and controls there, in case a future owner wants them for a Vintage Air unit.

I think the only thing I'll have to make is a big plate to cover the hole in the firewall. I believe that someone makes one that is super expensive, but I think it has a hole for mounting a blower fan. I will need a complete block off. Any ideas?

Anything else I need to be aware of before I start taking stuff off?