I also had some time to update my KIS motor mount model.
The 3/16 balsa tripods were strong enough to bend and twist the
3/8 ply firewall so I cut out another firewall from 3/4 pine
and glued the 3/8 ply firewall to that. That stiffened up the
whole works giving me more confidence in the double tripod
motor mount scheme. If you make one of these use 3/4 ply minimum
for the firewall. I also redid the model of Tracy's redrive to look
more like the real thing. Could not find  1 1/2 dowel for the redrive model 
so had to laminate a couple of pieces of hard wood together and 
turn it on the lathe. Much harder to do than say with only a three jaw chuck.

Next addition will be a scale turbo charger. Just for fun as I already know
it fits fine in the full size mockup.

BTW these rubber bushing are 29 inches apart center to center to reduce
torque vibration transmissions into the airframe. My goal is luxury
car type comfort, noise and vibration :-)

Somebody also mentioned a worry about neoprene temperature resistance. You can 
always make your own rubber bushing out of 1/8 thick red silicone rubber sheet
available from AC Spruce and McMaster Carr. Cut out a bunch of 
rubber washers and glue them together with red RTV silicone adhesive.
Copy the Barry design. Should be good up to 400 degrees.

Paul Lamar
 
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