I've started the build on mine taking my time by design. I've never built an Electric pattern plane so new skills must be learned.

I came to mounting the motor and looking at it for a few days while glue was drying on other stuff I had a time figuring it out.

How to get the firewall marked for the motor when I couldn't get to either side to mark the spots for the bolts?

This is how I did it for better or worse.

Cut the whole in the front of the fuse, 2.5" hole saw.

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I then took a 3mm screw and cut it into 3 3/8" long pieces.

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I then screwed them into the mounting plates leaving about 1/8" sticking out.
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I then put the motor with spinner and backplate into the nose and centered it all up then took the firewall pattern and pressed it into the motor thus marking the bolts locations so I could drill them.

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It worked pretty well. I wanted the wires of the motor down and one bolt straight up, seems I miss calculated the size of the upper cooling hole. I'll make a new pattern allowing more surface for the upper bolt mounting. Once satisfied I'll transfer the pattern to the real carbon sandwhich plate and install it.

Tim