My original plan was about four times larger than I have available … my tabletop is four baseplates wide (baseplates are 25 cm/10 inches a side.)

The first thing that told me I’d be biting off more than I could chew was realizing I’d need about 45 baseplates.
The sheer work involved in building them and the cost were the next considerations. I reminded myself of the premise.
“Bosley and Co are building their accommodation on an island that nobody wants, surrounded by wetlands.”
The cost of the wetlands alone would’ve been beyond the scope of the project. Transparent light blue 1×2 tiles are 22 cents each in my scene.
I decided to go back to my original idea. Instead of covering seven baseplates with swamp, I’ll make one, at most two, swamps and move them around as needed.
I’m not sure yet what I’ll do about the deep water river channel. Two baseplates already but including with the channel, places for large ships and small boats to dock. As seen below:
