My Jurassic is built from the original Jetmag drawings, and with careful placement I was able to fit Hitec 5245's. They are .67"thick.
They are mounted to .040" aluminum covers, and on one of the upper corners they touch the the outside fiberglassing.

Exept for breaking the gears on one of them in a belly landing, they have held up fine.
A small ventral fin would have saved the servo and elevator horns.

Lars