Thank you guys,

thats a good start. As I'm a newbie on cats, I think
its not so important that they are exactly like the original ones. I think it's smart to follow your advice with the 2 %
area and make them thin enough to pass thru the trunks.

I had the impression I had to build something sophisticated,
with curves and such so they would move backwards in the trunk if I hit something underwater.

Thanks again for your time and knowlegde