Where to go next ?!

[Niwashi]

Only large mansions can hold all 8 crafting benches though

A medium house plus a private chamber within that house also works, as they can hold 6 and 2 respectively.

I'm not certain, but I think a small cottage plus two people's private chambers would work if they're opened for use by the rest of the FC (provided that giving people access includes giving them the ability to use crafting benches — that's the part I'm not certain of).

In the sort of small close-knit FC where everyone can be given decorating privileges, a small cottage with four crafting benches placed in the house with the other four in the storage room also works, as it's possible to just swap them around as needed so that whichever one you currently want to use is among the placed ones. (That's what my FC currently does.)

[Zaiaku]

A medium house plus a private chamber within that house also works, as they can hold 6 and 2 respectively.

I had not thought of this! An excellent idea indeed.