RE: Pica 1/5 Scale Spitfire
I used the Shindin Machine retracts on mine. If you go over to rcscalebuilder.com there are several build threads for the 1/5 PICA Spit under the PICA heading. Go ahead and become a site supporter and you can enjoy the site to its fullest. The site supporters have a monthly download that is free to them. I've downloaded two Anderson plans (Arado and LA-7) so far and some walkarounds.
Tim