Hi Destroyer 42,
If you go to their website they have GA drawings of all their designs:
[url]http://www.rotortug.com/scripts/designs.php[url]
Like most Companies these days, they are very cagey about releasing too much info ie. hull sections, but as their GA's have plan, profile , fore and aft views it is quite easy to draught your own frames.
I have no idea where I got the attached drawing from or which design it's from (I have a feeling it's from the RT-60).
If you need photos of the RT's try this website:
[url]http://www.tugboats.de/index2e.html[url],
some good walkaround photos and even below waterline (while in drydock
).
Hope this of some use.
Roger.