RE: Which WWII Warbird?
On rcscalebuilder.com there are tons of build threads on the stuka. Some guys do a 3pc wing. I didn't bother because I have a trailer. If you don't go nuts on the scale detail and add a ton of paint it can come in at under 24 pounds and has a large wing area with dihedrel because of the gull wing and it just floats along. The ziroli one does well with a G-62 (or I see now the aerovate engines have a 62cc engine that has a rear carb meaning it doesn't stick out the cowl like the G62) or even a little larger - mine has a 3W80 only because I already had one.
I'd say really out of all "warbirds" it's the easiest to fly from my limited experience.