ORIGINAL: Ramstein44
Ok, so here is what I came up with for the engine installation, the only problem is I'll have to remove the muffler before I can open the hatch

. I should have the gear here next week

. I bolted the engine directly to the wood and reinforced the top and bottom of the engine mount. Soo close...
May I offer a possible solution to your problem of having to remove your current muffler to remove the chin scoop hatch? Remove the 90 degree right angle adapter as well as the muffler your using.
Instead, use a flex pipe coming directly out the back of the cylinder where the exhaust port is. Route the flex pipe under the "chin scoop" and cut out a rear chin scoop flap.
I did this on the KMP Me-109. This would allow you to remove the chin scoop hatch and fiddle with the needles or do whatever else like changing the glow plug without removing the muffler and it would also clean up the appearance.
Please see pics for reference.
The flex pipe I used had a pressure tap on it so it did pressurize the fuel tank.