Part of me feels like the moonhawk should have a slant 6 or even a slant 4(international half v8 technically counts as a slant 4)just to be different from gavril. But we should at least be able to build up the straight 6, people have done some crazy builds with inline 6 engines in the past. Heck, why not make a 6.5 liter two/three rotor turbo* (yes big block rotory, because 'merica) as a super rare concept variant, just for giggles. * chevrolet did expriment with rotory engines in the 70's the vega was one example, another one would be the prototype for the c4 corvette(mid engined 6.2L 4-rotor).