hi mate
have a look at http://www.warbirds-rc.com/ web site, they have done a build of this bird and put air retracts etc on it. this will give you some good info on doing a build. i have been adivise to fly with 2x 4c of around 3700 to get the proformance out of it. i still have one in the box which after i get the mig 15 going i have just received should give me the push to get moving on this one.