RE: I need your help with a conversion
Mike,
Your questions are good, however, the responses could take quite a bit of space and time as opinions are plentyfull. Welcome to the world of research and development.
Norm Goyer will probably give you the best and quickest response, however, not much can be bought at Tower Hobbies. Hobby Lobby is the reliable place to go for electric. You could log in there and scroll down the Axi Motor line and you will come to the 2826, or 4120. Read a little about what and how many lipos will drive those motors. Perhaps give them a call for advice, it will cost more for the parts, but, your appear to be new to the conversion process, so, it wouldn't be wise for anyone to steer you toward China direct until your learn more. Stuff is much cheaper buying direct from China, but, you have to know what you are doing, some stuff is junk.
Good Luck
Al G.