I'd like to re-use some old eletronics I got. It's a e-max 2822 1200kv. Is it possible? What battery and props it could work?
It's about 60% heavier than the blue wonders (39g vs 24g), but other than the extra weight and the trouble you'll have ballancing it, I don't see why not.
The Kv is close, the wattage is higher, and they're recomending lightweight 3S. For balance I'd at least go with the heavy 3S (850mah, but consider a 1000mah, if you can fit it in the fuse). Alternitively consider moving the wing forward around inch or so, to shorten the motor's lever arm. If all else fails, balast on the tail, but the adding to wing loading goes against her floatyness.
The 9x4.7 they recomend (IMO) is a little overpropped on 3S for the Blue wonders -- OK, for burst, but not an extended climb WOT. still, it looks like you can get a lot of altitude in 30s, but you certianly don't want to "speck it out" on that combo. The e-max you have should should pull it along nicely on that prop, without complaining.