I haven't done all 20 projects yet, but here are the ones I've finished. I changed some of the boat designs in order to make them a tiny bit more realistic, like some mast placements, adding booms or a main sail, or just general shapes of the boats. Tiny changes though, and with just few of them.

I'll update the list as I paint the rest of the projects. :) 

 

Project 1:

 

Project 2:

 

Project 3:

 

Project 9:

 

Project 10:

 

Project 13:

 

Project 16:

 

Project 18:

 

Project 20:

 

Thanks Sukrutha for this awesome set of boat projects!