ORIGINAL: acdii
Originally I was thinking I could take that whole box off, and make a firewall for the glow engine and another for the electric and all I would need to do is bolt it onto the existing structure, but the ''firewall'' is actually the box, and not the part the cowl attaches to, that is just a thin piece of plywood, and not very structurally sound.
The new box is structurally solid itself; however, no chain is stronger that its weakest link.
Consider running long bolts from the engine's mount through the box and "firewall".
One part that is glued over a piece of plywood is actually glued to only one of the layers of that plywood.
Also consider that one of the reasons for structures supporting reciprocating engines to be heavy is to use their inertia to "absorb" the vibrations.
Good project, acdii
