When I made the steam engine larger and the opening larger, the superstructure ended up 93.85mm (W) x 106.82mm (L) with a skylight opening of 52.92mm (W) x 95.5mm (L). Those numbers are just what the CAD turned out .. the structure is made to fit the top of the engine room. I added four 1/4″ holes in the top for cowl ventilators.
I laser cut the pieces from 2mm Ply. Since the tab and slot construction of the structure is obvious, that has to be covered up. I have two options .. plate the sides to represent metal or plank it with wood. My “Story” is that this boat was built ~c. 1880 (ish) at which time the boat has a steel hull .. but I think at that time the superstructure would be wood so I will go that route.
I made the superstructure to fit the top of the engine room which is the gray wedge shape in this photo. This means that adding “planking” and trim to the sides of the structure means it will overhang the gray wedge. If I use 0.016″ Laserboard and 1″x4″ for the trim then it would overhang about 0.036″. I will address that issue later .. I can either leave the base tucked in the 0.036″ or add trim to bring it to the width of the structure after adding the planking and trim.
at this point I had some issues .. and after looking closer I decided to drop this design and … something .. MORE … so … off to V3