Forgot to mention the above photos are three different models I currently have in the works using R/C glass filled engine mounts.
The Fire Boss, a crop duster biplane and the Gee Bee R-3.
I also have one more design in the works, this would be the Biplane Pusher. No hurry with that design.
I do like the idea of using these kind of mounts for these particular designs because as it was mentioned, engine choices can easily be changed.
Engines can be changed without altering the model also.
As you can see I have my hands full with a good deal of work ahead of me.
Here's photos of the aircraft I'm modeling using the glass filled mounts. The GBR3 isn't an actual aircraft.
CB