But mainly we have to keep in mind that Rhino 6 is limitless when you know what you’re doing !
even in the class A philosophy, the question is are you doing a concept or are you surfacing
but a such great drafting tools 
You need to have the full probe of all the Rhino’s tools since some parts are pleasant for your eyes
then you can now project a clean set of beziers curves and making the surfacing with intelligence in your new architecture network since its a projection (not constraint by the old underlying architecture)…
But, at this stage, it’s a “pro work” and you need to know what you are doing 
we can’t sheat with time sadly… anyway, Good luck and have fun!
What’re people have trouble to understand is for this kind of welding, they are several other efficient way to do it … in a more mechanical way without an aesthetic goal…
and for 80% of the time it’s ok but if you attempt to do it with a design, a sketch, by sketch i mean a concept a specific stylistic design, you hold naturally the problem differently and don’t spend 10 hours of surfacing for something which is not at the core of your project…
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