You have some great advice from the guys above. I did my Sig K. Senior back in 2008. I used a Turnigy low 500Kv range 60 size motor with a 60 Amp Esc that can handle up to 6s lipos. .I flew 4s for years, Now I upped it to 5s with reserve power. Hobby King makes a nice adjustable mount to set up alignment and length. I flew with a 14x6 Apc prop and sometimes wood prop with no problems. I cut the top nose of the fuselage in the tank area for a drop in battery. I have been flying this plane for years now an it is one of my favorites I cannot live without. Here is a video and pics I posted earlier in this link here. It demos the flight and the great characteristics as an under wing tilt camera system I use a lot. The camera system is strapped on under the wing with elastics, Go for it. You will never be sorry. Enjoy.
~~Sig Kadet Brotherhood~~.
**Neons** Bob