Using the "Curved Bow, Narrow, 14x6" plan, which is quite small to say the least, I drew up a quick plan of my houseboat. Not the best picture, but only one in existance, since my game crashed while saving.
I also got confused as to which way I was building which is why the second floor is not on the first's right.
Green is the ladders, which I'd add another on the other end for traffic reasons, yellow lines means a bunk bed. Blue are the all in one bathrooms and I forgot about the steering wheel thing which will go where the empty room is, second floor.
Anyway, there's plenty of room for my 7 sims and room for one more if I want mermaid babies. Even a real bathroom on the second floor. And there's always a cellar for my...perfectly normal 'nectar' storage where nothing magical happens...ever...and a vampire doesn't sleep. The real thing will be a barge probably, but people were thinking they were too small.
Feel free to post your plans and to comment on mine.
Comments
https://forum.thesims3.com/jforum/posts/list/677226.page
The best thing is that SimGuruSemedi popped in to give everyone the dimensions:
Now, if only we could get them to tell us the dimensions of the resort towers. I think I'm going to start a new threat about that.
EDIT: Duh! Reading your OP again, it looks like you do already know the houseboat dimensions.
Hope to see more ideas here and I'll try to come up with my own blueprints soon.