Thanks!!

What I can see would have me make a 1/8" ply doubler that would cover 1/2 the inside of the firewall, top to bottom, right to left, from right side to left looking at it from the front. After that was epoxied in place I would use another piece of 1/8" lite ply to fill the void at the front of the firewall to provide a level mount for the stand offs. The whole job shouldn't take much more than a couple of hours at a cost of $10.00 or less.

The reason for the 1/2 inside is to spread the good stuff over the existing part of the firewall that remains, balancing the load a little. More secure in the long run for the engine mount. Unfortunately there is no way that a repair will ever come out lighter than the original unless you started with wood and went with composites later. Not practical in this case. The end result will likely end up about 1-1/2 ounces added to the nose. Moving a battery or choke servo will easily offset that.

Good luck,
Pat