RE: Top Flite AT6
The TopFlite AT-6 was a great kit. I have one in the fleet. The Ziroli plans result in a dynamite aircraft but it's much larger - 101" vs 71" for the TopFlite. Hope you have luck in finding one. The old Midwest kit at 80" (also discontinued) also shows up once in a while.
I believe Robart still carries the retracts for the TopFlite.