This is a great kit. I have built 4 of them . The best motor is either a .25 or.30 size 4 stroke or a .25 size two stroke. You can cover this with monokote. Seems like the construction for the tips require the tips to be centered on the last wing rib if I remember correctly and then carved and tapered into that rib and leading edge. I have also built the 5th scale Cub and it also is a great kit but it is a step or two above the one you are building. With a .25 os fp this this will fly just about like a full size Cub with 65 or 85 hp.