Hakim, It reads like you want to do a lease with an option to purchase. 

In high appreciation markets, accelerated payments or buying cash flow is a horrendous return compared to other options.  

So I'm not sure how that would affect this option but it might but this option costs $0 in capital to you - unless the contractor wants like a 10k deposit or something.

I'm not sure on what financing options are available in this situation.

We've considered the two options:1.

Then your options open up even further.

@Joval Mathai best option would be to work with an investor agent or wholesaler.

In exchange for their financial support, partnering with investors who have money to invest but do not have the time or experience to locate and manage properties might provide invaluable information.One can purchase homes with little to no down payment by utilizing creative financing alternatives such as seller carryback financing, lease options, and subject-to transactions.

There are low money down options for people without experience, but you'd usually need good credit.

The yearly contributions would just be a bonus.Also, I know a SDIRA is the more obvious option.