Got it Mid7night - I did read about the straight pod. I was going mount the firewall from the other end instead.
I think it'd be hilarious if whoever tries the RD2205 or 2206 on a 4S makes sure to paint the plane plaid, like from the clip. (it won't be me I'm just happy to keep it in the air. I'm going to try this with and "A" pack first, as I am NOT a skilled pilot yet.