I believe that this aligns well with the long term growth of Austin. 

Then, your alignment of interests with the sponsor.

I would only consider taking on something like this in a partnership manner, where a local person, be it the contractor, a real estate agent, flipper, property manager, etc has real skin in the game, too, to help align their interests. 

This type of opportunity aligns perfectly with our strategy to move fast and capitalize on quick flips.

I'm more aligned with @Rick Albert on this one. 

If I can find a great coach/mentor, someone whose values align well with the group, I have no problem doing business.

I can assist you in understanding financing options, analyzing deals, and developing strategies that align with your investment goals.If you have any questions or would like to discuss your plans further, feel free to reach out.

Ultimately, it's about finding the investing strategy that aligns with your goals, lifestyle, and area of expertise/skills/knowledge.

That said, Solo 401(k) with Roth component can be powerful and does open up the discussion with your CPA or tax pro about paying yourself more (within reason), in order to make higher contributions. 

So if you are going to do another 5% down then the FHA component matters less.