Sounds like a good project!

I would recommend a Mega 1615-6 or 7 turns and a graupner speed prop 7x7 for the 7 turn motor or a 6.5 X 6.5 for the 6 turn motor. A hacker 18-3p brushless controller and 10 - 1100 NiMH cells. You will get 6 to 7 minutes of full throttle and plenty of pull.

The hacker ESC has adjustable timing with 4 settings. The Jetti's do not, but I heard they just came out with a Jetti pro version that is adjustable. The timing advance in the controller is very much worth the extra $10.00.

I think most everybody is overlooking the advantages of the higher turn count Megas. You get in this mindset where it's a certain number of Amps for a certain weight and performance level. With more turns and steeper bigger props you get better efficiency, at flight speeds, getting the same performance on fewer amps, adding duration almost for free. The hacker 20L with the teeny prop is a wasteful inefficient suggestion for your airframe IMO. Most of your prop wash will be blasting the cowl. If it were mine. I would use the 7 turn mega, the 7x7 prop and full 30 degree advance on the controller timing. Low speed pull will weaken but that one isn't supposed to go slow anyway! it should pull in the 70's somewhere.

Electrics smell better than gas!