I have to agree with Minn. Build it as per plans, but do add the reinforcment for the landing gears. I also agree that the Hobbico retracts are less than desirable. I will however say that I made one of the prettiest landings I have ever made with one wheel after the strut feel out on final. My son's has a 46 on it and it is a great flying plane. If memory serves me correct, it is using the Ultra Sport wing so the P 51 has no tendancy to want stall. Good Luck, Dave