I also got rid of my factory heat and a/c. Was broken and taking up space. Might go with vintage air soon. There was a big hole in the firewall so I bought some diamond plate and made a cover for it. Could be a little better but it works for what I need it to. Ended up using it to mount my hyperspark box, coil, and relays to. Need to clean up wiring in the engine bay to prevent fires and make it look decent.
Also not sure if I like the layout if it all yet or not. Might change in the future as well.