The newer cabinet doors might be harder to find but it looks like it would be easy to make doors to match the older flat panel doors.Also, try looking at Restore the Habitat for Humanity thrift store or other used building supply places.

Instead of renting, move that money into a more valuable asset and continue building equity.

What would be the best way to build a contract for house hacking  without hiring a real estate attorney ?  

:)Having done something similar years ago, would advise you NOT to quit W-2 until you have a crew you can depend on to do at least 80% of the rehab work.You should also be building a network that exposes you to more deals than you can currently handle.Otherwise, you're just trading one job for another and won't be able to scale enough to generate the number of flips you need to replace W-2 job.

I'm planning to build one of the preapproved ADU plans provided by the city of Sacramento in my backyard (using a an owner-build permit).

I am hoping to like many others build up a good retirement through real estate and are looking for opportunities to learn good practices, soft skills and gain confidence and build repeatable systems that can scale. 

You’re building up an asset that you can use for buying other assets.I use this strategy with business owners quite a bit who’ve maxed out their retirement accounts.Leverage, leverage, leverage!

I would house hack subsidize my mortgage which gives time to build up capital and would refinance to conventional loan and start my next investment!

Assuming the building has land basis, there would be a gain on distribution in excess of basis. 

Remarkably, everything aligned perfectly according to my plans, leaving me in awe of the reality I was living in.Presently, I continue to strategize and aspire to acquire more properties, with the goal of becoming a successful realtor investor, further building my real estate portfolio.