I think the mod needs a Sawmill. Funktion is bulk crafting the aa lumber also making straw from wood.

Next a stone saw, bulk crafting the ss stone blocks and make flint from stone.

Last sugestion in the past the entrances of harbors have as gates a chain from one side to the other. chain up entrance blocked, chain down ships can come and go. roman empire used it.
So a chain gate will be nice 20 foundations wide 4 deep 8 high and snaping to the slap foundations.

So the bug is simple (i hope) the tall slap foundations have a texture on the bottom this is missing on the botten of the normal slap foundations.