Naaa, the inverted mounting is just fine, just don't use a airbleed carb engine, usually the cheaper engines with plain bearings have single needle carbs. Mine had a supertiger gs 40 ring, worked perfectly. I started mine like normal on it's wheels and tweaked the needle to peak and did the nose high tune as well. I will be building my re-release soon, after my extra 40 build. I'm using the same setup I used before, ST 40 and maybe a tuned pipe or a tatone muffler to keep it conceiled. Possibly I might make a plug of the nose and make a cowl.