Looking a tutorial to make a custom part!

[Philippe Hurbain]

Philo, I'm not sure what is up with your version. 4.3 was released at the end of January 2018, not the beginning of January 2017. I think you have a development version that I incorrectly labeled as 4.3. The official 4.3 version should have the "Draw transparent textures last" option in its Primitives preferences (as seen in Trevor's and Johann's screenshots).

Yes, my bad. At the time I updated another computer but apparently not this one! What fooled me is that when I wanted to check, I googled LDView... and stumbled on the old Sourceforge page with only 4.2 version! It would be a very good thing to place a note there directing to Github page (which appears in Google results too, but only in 5th or 6th place!).
Upgraded now, works perfectly!