Thanks for your info about CAD software.
I will explore them one by one which will take me some time.
In particular, I would like to install any Windows -only- software on Linux also.
For example, MoI3D runs actually on top of Lubuntu+Wine and an another PC with Win10.

My actual traget is to found an easy to use rendering software.
Sometime ago I was using Bryce6.0 (free edition) but it disapeared.

You are doing a very nice job on boatsand hull shape.
Of course. I will continue to share hull design on this forum with more and more details.
Regards
Eric