This sounds like a fantastic challenge! Just to clarify, while both sims are busy with the four designated money making skills, you are only allowed to sell the items from a single sim's skill, and only from one of his/her two skills not both. What do you do with the remaining items? i.e. If using paintings, but your sim is also busy with fishing, and the other one with gardening and woodworking, do you place the fish, garden produce & woodworking items onto the lot or can you sell them too?