Jerry Hey wrote:

What do you think of riveting or bolting a piece of the 4130 hat
section  to the firewall to stiffen it for the rear motor mount strut?
  The strut bracket would be welded to the hat section.   Jerry

If you are careful about the design you can use the walls of the hat section
as the bracket. Just weld on a couple of washer where the bolt goes
like this Questair bracket.

Paul Lamar
 
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