Wynn
The most difficult part was converting an old power supply and mounting it in the case. If you want to do something like this the information for converting an ATX computer power supply is readily available on the internet. I would use a 500 Watt supply for the FMA 10S Charger. This may be overkill but the cost is very reasonable around $20-30. You will end up with several feet of extra wire and a bunch of connectors form the power supply conversion.
I bought an inexpensive box to house everything in. I did have to cut an air outlet in the side of the case but this is not much of a challenge for any modeler with a Dremel tool. I wanted access to the 12 & 5VDC so a couple of banana pugs from Radio Shack did the trick. I had some circuit board material to mount them on but 1/8” plywood would do just as well. A Sermos (AKA Anderson Power poles) is used to connect the power supply to the charger and if need be, a Sermos to alligator clips connects the charger to a car battery.
I keep all the connectors, extra wires and battery log book in the charging bag when not in use.
Wynn I gota ask were did you get the airplane? I know you want to convert to electric and I'm looking forward to the results.
Norm