Looks like a great truck to drive and "improve" as you go. The AC and heater hose routing looks odd to me.. Compressor missing? I am about 18 months ahead of you on a similar journey. Unfortunately, it is more expensive than you think
You will have lots of fun nonetheless. If you want to reinstall the aux tanks, PM me. I can give you a few tips on hardware and workarounds as the pieces needed can be difficult to source.