I just had a look to Karim’s work, it’s amazing, I don’t need to do it myself !!! I can’t find the tutorial video he wrote about, do you know where it is ? Thank you so much again !!!
If I may, could I ask you for advices : how to put an object inside a blueprint (is that correct ?). Export in mdl or obj format ? Another ? Thank you 
I need to train before going underwater !