ORIGINAL: Mk23socom
I have an LT 25 that I built and I cant say I havent been less than 100% happy with it. I used an OS LA .40 in it so that I would have enough oomph to pull out of something hairy close to the ground but I am sure that something less will certainly fly it without any problems. I used a Nickel Metal battery at 1500Mah and standard Hitec servos and even with the reinforcing of the bulkhead in front of the wing and the tailwheel area it still weighs around 5lbs and a few ounces with fuel. I would suggest the reinforcements if you have a rough field since mine has survived a few trips into the brambles with nothing more than some popped covering. You are going to be SO happy with this plane, it's so forgiving and you can land it like a butterfly with sore feet! Good luck on the build but you wont need it, Sig includes a wonderful manual with that build!
I have a smooth paved runway, but I'm curious as to what your plane came out so heavy? I built a 4*40 with a Magnum .51 FS that came in at an even 5 lbs.