Thank you for the confirmation of the rules!!

It's easier and more enjoyable for me to build without Sims on the lot and since I am more of a builder type Sims 3 player, I chose to focus on the build part of the challenge. = Build 7 individual homes on the lot that allows for craft/skill space.
I am using an edited save on Builder's Island. It has some basic rabbit holes, like City Hall. I also have added a few residential lots and Sims to those lots.
I'm using a 50x50 lot for this challenge. I named it Azure Acres and divided up into 7 fenced "lots" and one shared "community" lot.

Some of these skills I am not sure how to actually sell the items, other than out of the Sim's inventory.
I do have the bakery, art studio (jewelry) and savvy seller, but have never really used savvy seller.
I was thinking maybe creating a consignment type of shop so the Sims can sell the items.