Trying to work out my potential engine mounting tactics for a G62 in my SBD prior to purchasing the engine. I've put together an illustration that shows the G62 sideview overlayed on a shot of my SBD plans.

The 1/4" plywood firewall (shown in red) has a big balsa firewall/cowl ring that goes around the perimeter of the firewall. If I line the spinner plates up between the plan and the G62 drawing, it shows me that I'll need to cut a small hole in the cowl bottom for the spark plug.

My question is this...

I've shown the "engine mount" in green, and I've got about 1.5" of space here to work with, keeping the spinner plates aligned. I think that the B&B cup mount is longer than 1.5" so I'll probably have to build something out of wood. A friend told me he's just used a regular 2x4 for a mounting block on all 3 of his G62 planes, and cut a hole in the center of the 2x4, and mounted the stock back plate to it. Is this the best method? Any other ideas?

Thanks,

Neo