You are right Frank, that's the system I was speaking about and that's the one that seem the easiest and most practical( to built and use). But the other system using a snorschell is more realistic and more attractive for my taste, and if any body knew the elements to make it work, specially in a DK VII model (1/48 scale, about 55" long =1.4 meter), I would really like it !
Any help will be very much appreciate,
Happy bubbles to every body,
Francois