How to smoothly cap this object ?

 From:  mkdm
7928.19 
Hi everyone!

I sincerely wish to thank each of you for your help and your ingenuity!

A special thanks go to BurrMan for his video tutorial.

In order to become better skilled in Moi, i'm trying all of the different techniques and approaches, that you showed me.

I'm experiencing even that every minor change to the different procedures,
leads me to a very different final result, especially regarding to the surface continuity.

Merely born as an accidental modeling study, thanks to your suggestions,
this "chair" is becoming a good and unexpected workbench.

My actual goal is to become sufficiently accustomed to dealing with
solids made by a mix of sharp edges and g2 smoothed areas, with or without filleting.

Thanks again to all of you and have a nice night.

Marco.