RE: 23 pound twin
Foam core wings covered with wood and then glassed could be very heavy. I would use conventional wood construction with lightning hnoles in ribs tips etc. If possible you may consider Monocote for coveringv wing and surfaces rather than sheet and liqid finishes, you will save a bundle of weight this way. I use 22.2 volts on my 4120 and it seems just rigvht, but with your set up you are driving two motors, two ESCs so you will need double the amps. The volts to the two motors will remain the same 22.2 volts or whatever you put in but the amperage drawn will double so you have to have suffcient power in the batteries. Looks like at least 7 or 8,0-00 mas to me. I ssuggerst you check with the guys at Hob by Lo bby for exactly the right combo on your power. They are super guys and know their electrics. Norm
also make sure you use separate battery for receiver and servos don't use an BEC on this set up and I would use 6 volts with at least 2000 ma cells for receiver pack.