Move your battery as far back as you can, along with the RX. The 100 weighs in at about the same as the FG-11 with the module. I put the module at COG, and use a 2500 mah Life with dual leads. I haven't put the cowl on, and it comes in at about 2 ounces, so I will need to add some dead weight to counter it. Right now I am flying without the cowl until the engine is broken in, and I want to put a 90* adapter to put the muffler on the bottom and not out the side, fewer holes in the cowl. I have also had bad luck after putting on a cowl, both planes that I put cowls on I crashed the first flight afterwards. The 100 will work fine with the stock mounts too, but I dont know about using a 3 blade prop, it takes a bit to get this plane up to speed. Will be interested in how it does, I have one sitting on a shelf that came with the 100 GK I have.