The very same XL hull base, now with a complete and functioning steam power plant as well as a front static keel and rear steerable keel for stability and agility. The paint was added to make it easier to use the "Replace Colour" painting option to change the exterior/interior to the desired colour(s) without changing the entire ship.
Disclaimer: I do not need credit if you use this hull base, but I would love it if you share what you create with this hull.