ORIGINAL: RC-FIEND
I feel you can use coro if you cover the parts where the engine touches the mount with CA covered balsa. This way it won't melt the coro when hot and you will save on weight. Of course you know the CA is for fire proofing the mount and fire wall. GL
coro won't hold the weight, especially a g26. use balsa to support it? bah. that balsa IS your engine mount. would you use balsa as a mount ANYWHERE? Don't think so.