RE: P-51 Kits
The building/flying of a P-51 depends upon your ability. There are ARF quality A/C out there, and very tedious to build up ones. For the lower end go to the web pages of current advertisers, and for the upper end take a quick run through the pages at RCSCALEBUILDER.
One fast way to separate the ARF quality from a real scale job is to see if the landing gear is hinged up near the leading edge or not. If you want something to resemble a P-51 then aim towards the arf end.
Wm.