Thanks Tread... I'm thinking it may be a "best option".
The Maxi-Brute cans
literally slip
right on and fit
PERFECTLY with no modification to the toy. If the electronics are retained, then the engine lights would even still work.
The MB cans do have short-comings. The individual "feathers" (of the "turkey feathers") are too large and too few. The cans in general are a bit too big, but I feel too big is a better option than too small. And in using the MB cans you get a "pinch" in the overall engine (inherent to the toy) just before the cans widen out and then taper.
There are various other options, but all would take a lot more work:
--mold and re-mold a true studio scale complete engine to shrink it down (much work and a little "loose")
--Scratch build either the entire engine or at least new cans
--"Other"
Factoring the pros and cons, I think the MB cans (to recapitulate) may be the best bet...
But I'd still love outside opinions on the overall look of the porportions.

Clearly I'm sold on using them, and my bias may be blinding me to how the strike someone "fresh" to the idea of uusing them.
Here's the pic again so you don't have to page back...