If you're running into continuity issues Blend and Fillet are the commands in MoI that you'd want to try using to clear those up. Automotive surfacing is challenging even with specific surfacing tools.
and determined by the same designer from Russia, you can adapt some things in moi3d.
(is relevant only up 3 minute until minute 37, rest are not native commands, tut. only in russ-language) https://www.youtube.com/watch?v=SXUf6MXDzA0
regards