I don't think you want sandwich on this part. Sandwich is
   stiff up to a certain load but after that it collapses.
   I think you want solid carbon fiber. The part is relatively
   small, unlike a wing skin, so the weight penalty will be little.


   Paul Lamar ...No rotor no motor.

Paul,
I think you could go either way. Manufacture of a sandwich part is
harder to set up though so a straight layup would  be an easier way to
get going. So back to fire hazards; do we think the weight savings and
manufacturability is risk justified? Because I built an Autoclave we
could make these in.
Bill Jepson

Do you have a vacuum bag set up? Autoclaving these things
would be great. I guess you could shield it with fibrefrax and
and thin SS if you were worried about fire. Lots of
composite firewalls out there.