Allan,
the aluminium undercarriage weighs in at 400 grams inclusive of spats, wheels, nuts and bolts etc.
I decided to get access to the batteries by going cutting the front of the cockpit off and boxing it with a bit of balsa to make it solid. I added a hatch clip on top to keep it in place and it all looks pretty solid.
I've just competed the U/C in ali as stated and the wings are complete but yet to be covered. the next job is the struts. the power train is pretty much the same, 600w with a 70 amp controller on 11 x 9 and 4s. or maybe if i can away with it a 10 x 8 three blader. I built from the cnc pack.
regards
John