Evil Merlin,
I respect your statement on the Moki but have to differ with you. I have a 1.8 in a Platt Spitfire and it is inverted and runs very well in that position. I do however recommend using an on-board glow for insurance. I was thinking of using an OS 1.20 AX, it's the same mounting footprint as the .91AX and as such should not hang out that much. I will also probably use a Bennett muffler since I've had great luck with Dick Bennett's work. JMTC! I also will try to use the diamond treaded Robart wheels instead of the Williams Brothers vinatge wheels. The Robarts are marked for WWII German aircraft.

Happy Holidays!

Loopman