RE: Is this a dumb idea??
actually just one correction, the xl was the long boom but i agree that you don't want to put the kings electronics onto a trex 450. i suggest that if cost is a factor just keep flying the king2 and buy the parts as you can afford them. make sure to get at least the 450S as the X and XL use a different swash from the S (A or CF), SE and SE V2.