I don't believe there are any kits of the "Echo" model available but, if you can find the Acedemy 1/35 UH-1C you can always convert.
If you need, I have a few pictures and drawings of the "Echo" model with the TAT-101 turret.
Oh, and to the forums. Looking forward to seeing your builds and maybe you can give a few tips on the "Echo" bird.