My 6 berth (?) Swordsman rear cab roof has a plywood skin and has been overlaid with planking (my first attempt at planking anything). Maybe if I can get a little better at adding planking to a model in the future, I will see if if I can replicate the distinctive caulking lines that can be seen on the real thing, but for now I have tried to use strips of wood that vary in shade a little and hope that when they are varnished they wont look too bad.
The un-finished turret will be the base for the escape hatch but I won't be dong any more work on that until after I have got some varnish on the planks and I have found some better pictures of the real thing as I believe the four bars that run across the top of it are right-angled sections of steel (presumably stainless).
On one Swordsman that I have seen pictures of, these four bars actually look a bit "agricultural", and (to me at least) don't look like they belong on such an expensive and well finished boat. These four angle bars look like they are cut in the middle and welded in a peak shape to cover the domed roof light "lens" rather than being "shaped" to make them follow the lens curvature and look nicer.
I don't know how much detail I will try to replicate on this escape hatch as my Swordsman will be a "working boat" and so it will only be seen at some distance as it plows around the lake. I also think I have positioned the escape hatch base a little too far forwards - and that looks even worse now that I have added a small "lip" on the rear end of the cab roof - although the lip does make this cabin top look better when viewed from the stern than it did without the lip.
The wooden "cap" that temporarily sits on top of this base is too heavy and would make the escape hatch too tall, and even though I will be taking some "artistic licence" by claiming that my finished model has been "custom built to a particular customers individual specification" this needs changing and the finished item will be lower.
I think in the longer term I will scrap this roof and make anther one, but for now it will stay as I want to make some more progress on getting the boat on the water so I can enjoy running it. This lack of attention to detail would probably horrify the true scale modellers, but I like to use my boats rather than worry too much about every last detail - if they "look right" - I am happy!