I will cut my own foam cores then sheet with balsa. Typical balsa slab sides with lightning holes.
I am using an exceed 2205 3400kv motor with a 6x4 apc prop and a 1700 3s battery.
http://www.hobbypartz.com/86ma68-2205-3400kv.html
The old Ace R/C planes just fly so well they are hard to not build a couple of each.
Buzz.