Mine has extra power with the Saito .91, the .70 should be ok just watch not to tip stall on takeoff.

This pic is a takeoff at about 1/2 throttle. (there is a 6 oz smoke tank in there as well)

I followed most mods on Fubar except moving the landing gear and I kept the regular metal bolts with no issues. I also rounded the tail a bit. I can't think of where you could lighten the hog further.

All in all it's a hard plane to beat and real easy to fly.

Bob aka Nuker