5; Do you have someone that will look over the boats to insure the holding tanks are in good shape, the toilets are working properly, the batteries are good, the appliances are working properly, the electrical systems are safe and working properly, the top deck is in good shape?  

It doesn't sound like a pure FO, rather a blind fund. 

You technically give all your power back to the grid, you can't run your house off of a solar system when the power is out (without a backup battery system due to variability of solar output).6) I wouldn't install on an old roof, no issues otherwise.7) solar company will discuss location and output before instillation, non issue.  

I still get the other 3 out of the 4 advantages (cash flow - very minimal with financing option, appreciation - which is pure speculation, mortgage pay down - the only life saver, depreciation/tax advantages - diminishes for high incomes).

@Marissa Turrubiates, the answer depends on what an income you get now that you do not have an acquisition manager:If the income is low, the acquisition manager will not work for you even for 100% of the profit.If the income is sufficient to hire an acquisition manager then the acquisition manager will prefer to work for your salary.It will be difficult to find an acquisition manager who is willing to work for you for some interest.Those who work on a pure percentage, are mostly high-class specialists.

I'd rather just buy a house that will be an investment (purely to generate income) and stay living where I am until I can purchase a home for myself.

It becomes a bit trickier when comparing development projects to pure acquisitions (existing properties) given the two deals have very different inherent risks, however a general rule of thumb is that a development project should generate a YoC 1.5%-2.5% higher than the market cap rate (what it would cost to buy a existing duplex).

I do not think this will change within the next few years since I think the interest rates will remain in this range for a few years going forward and I don't see there being any large corrections in housing prices to compensate purely because the housing supply is still very limited.

I've worked as a W2 employee in between starting businesses as a web development for a battery company.

Were you looking to house-hack this duplex or is it purely investment?