Thanks a lot for your comments.
@sdee @Tacit_Exit The biggest problem is that the buildings are very irregular so I can’t use the standard house tool. I used mostly the floor and free block placing tools.
The wall tool can also be used, leaving the holes for the windows and doors and then placing them after finishing the wall as a completely different building using the “ghost slab technique”
The roofs are totally free block.
I treated the tenshu, towers and gallery walls as different houses and then built one floor at a time. This way I avoided having problems with the hearthlings getting stuck and stopping the construction. The top roof is treated as another floor made only of free blocks.
Each part of the complex is built separately:
Designing a tenshu floor:
To help them I used player placed ladders freely. Usually placing a first one (priming ladder) to help them start the construction. The scaffolding is always built around the widest perimeter of blocks in the building. If this perimeter is not the lowest level of blocks, the hearthlings won’t be able to reach this lowest, not so wide, row of blocks, hence the ladder.
Also, in walls not in contact with the scafolding, ladders were needed in rows isolated by window/door holes or to help build internal columns.
The towers include in their design the link with the galleries to ease the process.
Basically, keeping each part of the building project as simple as posible to help the hearthlings do it. And keeping a close eye on their progress.
Have Fun. Kyth.