Been thinking of going down the AC route for some time. Bought the HobieDave bracket and have it sitting on the shelf.
As far as systems go - I'm looking towards the RestoMod AIr Bantam II Ultra Compact system ; https://www.restomodair.com/shopproducts/bantam-ii-ultra-compact-custom-air-conditioning-system/
As luck would have it, you can buy/rent a mock-up box to test fit. Just sent in my payment and once it arrives I'll have 30 days to see if it'll work. More to follow.