I am building a stinger 1.20 size plane. I am going to be putting a U.S. 41 cc engine in it. I have read to move the firewall back because of the weight. I would like to know how far to move it back. I am thinking of putting the servos in the rear of the fuse, to help out the balance problem, and to shorten the control rods. I saw a plane last week that had titanium rods. I think I will go that route. I have also read about sheeting the tail surfaces. I plan on doing this, and also adding the flying wires there. The kit says to use 1/4" brass tubing, cut out with a knife, to cut the 3/8 square balsa, for the dowel rods. I have tried my home-made cutter, and it still crushes the wood on a test piece. I'm not sure to go with the 80" wingspan, or the 72" yet. I am going to cut out the foam in the wings, between the cap strips either way. I am going to carbon fiber the top, and bottom of the wing, along the spars. I am also going to add 1/4" ply to the bottom of the landing gear to beef it up. I also have a problem with the engine mount. The muffler is about 1/2" farther back than the engine. Will the GP isolation mount correct this? I don't have a engine mount included when I bought the engine. I do see one listed at Tower, but i'm not sure if I need it or not. I have a 16 oz fuel tank for it. I'm looking to get at least 10 min flying time. Is that size tank big enough?. I will be not be using a pcm receiver on this plane. I have read that there could be electrical interference with the ignition system. I will use non-conducting push-rods for the throttle, and will get the Bosch plug cover. Is that all I have to be worried about? I have also heard about glassing the plastic parts. I have never done this before. Just wondering if it's worth it or not. Sorry about the long post. This will be my first "Big" plane, and I want to get it right the first time. You can email me directly, or post here. Any answers are greatly appreciated.