I have got into 3D designing several months earlier using 123D software Steve@ Model Monkey kindly advice me. My first designs were Lion Class Battleship turrets and superstructure for my own use in 1/350 scale. There's no problem with the turrets, but the measurement of the superstructure is a couple of millimeters too small from the actual measurement I drew in the software.
I have heard that others (EJ Foeth sent me an email, and Alain (username NOVA73) posted it in his thread of Dockyard and IJN Fuso at Nagasaki) use Illustrator programs, but I haven't yet so fully understand the process that I can do it on my own. It would be of infinite help if someone (who obviously can design PE) can post step by step pictures.
I didn't find the right solution from the Internet.