This is my suggestion.
Make an intermediate firewall out of 3/4 ply with .025 stainless
steel epoxed to both sides. This stiff sandwhich panel will then take 
high local bending loads allowing you to attach motor mounts 
tubes almost anywhere.

If you use the motor plate idea then you can move the motor
mount tubes outboard to clear a large water rad on the plug side
and a turbo on the hot side. The water rad air will exit out the right
side of the cowl with shark gill venetian blind flaps.

The MM tubes shown are on the shy side of the right diameter.
The lower tubes need to be checked for buckling. Perhaps
some as large as 1.5" dia. might be required. I'll know
more when I have better dimensions. The diagonal brace tubes
are not shown.

The aft part of the stock mount can be used as is and cut off
and attached to the back side of the intermediate firewall.

Paul Lamar
 
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