How about your UBEC (Ultimate BEC I'm assuming )and CC P-60 (I don't know what that is).
Esprits Mega 22/30/2 is 119 so you apparently got a $19 deal on the motor. And the Superbox is 50. So you got a $10 deal.
I think the 500 figure may be closer than your 400.
And, in Ohio, if I'm LUCKY I can fly 26 weeks out of the year, which is about 130 flights, 8oz per flight, 16 flts per gallon, 8.13 gallons per year, @15 per gallon 121.95. Add in a Saito .72, which does pull nicely, @224.00 and you have $345.95.
Granted, you don't have to wipe the oil off your plane. I can do that while you're charging your batts.
I understand that in one year we will be close to even and then the next year, you would theoretically spend nothing and I would spend another $121. I think the price of electrics will continue to come down so I am not on the bandwagon yet.
I do like your carbon fibre canopy. Very nice, will that work on a glow plane?