I did some research into some EV cars running this similar Cool Blue AC system. One in particular was a Dodge Neon in Phoenix AZ. The unit seemed to cool the car very well and kept the interior conditions descent for super hot AZ weather. My thought is maybe just try a similar system with same BTU output.
The reason for this is all the people that used this Cool Blue system or similar said while it did cool well but they wanted something a little more powerful or a system that would cool faster. So with that said all the cars I compared were your normal 5 seat sedans such as the Neon. These are much larger than the Centurion and since I will be only needing to cool the 2 seat cabin I think the 5,000 BTU might be just the perfect balance to cool it down quickly and keep it cool in the hottest of conditions.
So the plan will be to find the most efficient compact AC window unit at a competitive price point and utilize it with little modification. I will have to also purchase an inverter to run it on AC vs the DC battery pack. Maybe a few other odds and ends but the costs should be minimal. This will evolve without doubt but this is the basic starter plan as of now
More to come,
GH