I think you'll have a much better chance of succeeding if you allow transports and out-of-house trading.. I know this sounds a lot like Samura/Kishiro, but I know people have a hard enough time not getting bored while trading, and that's when they are in transports that make a lot of money... It becomes significantly more difficult when you're flying a ship that can be killed by anything and doesn't make much money.. And it's worse when you're confined to a single house.