RE: Am i missing anything.
How about your field battery for your starter? Various small tools for the tweeking that will need to be done. IE phillips head driver neeedle nose pliers long tips and short. I am not familiar with Thunder tiger but I havent heard any real horrror stories about them a few guys at my field use em and have good luck with them. You will probably use this engine on your first and possible 2nd plane. Given the fact that I dont know what your style of flying will be like when you transition to a 2nd and 3rd plane it would be tough to tell you if you picked the right engine for you as far as longevitiy goes. But for your set up its fine.