My first conversion had to be cheap and easy. I picked a GWS foamy Mitsu Zero fighter, added an integral-tank C*x reedy mill (Babe Bee type).

See 2 pixs at my member profile page, under 'GALLERY';

http://www.rcuniverse.com/community/...y&memid=317472

You can cover the sanded foam with dilute white glue and japanese tissue. (colored if you like)... then the foam will take lite coats of (yep thats right) DOPE! [X(]
(try this first on a foam cup).
Make needle valve and glow plug contact extensions to retain the full cowl. Be sure to provide air exits at rear of cowl.
Certainly an inexpensive ( in $ and time) intro to E2G conversions.

(PS; tip; check the decalage on the zero. Early copies were wrong.)