Do I need an attorney to help structure the loan and details?

I will be able to cash out my original down payment + 30k more if I wanted to but as im going through the process I was wondering in the future if I pursue investing full time how do you still get approved for mortgages?

I am hoping I do not have to go through the evection process (done it before all the way to sheriff kicking the door in) and its quite daunting process, but the upside I guess would be I been through it all. 

I am a residential remodeling contractor by trade with a solid understanding of the rehab process and a network of laborers and subcontractors that I can rely on, and thus plan on managing this first rehab myself. 

The use case will likely dictate the source/structure

FHA loans, in particular, are popular for house hacking due to their lower down payment requirements.Given your partnership structure and your father-in-law's involvement, you might explore conventional financing, FHA loans, or other owner-occupied loans.

Should the process be the same?

I'm currently in the process of building 2 new SFH in the Houston suburbs.

I found your very valuable to me as I in the in the process of buying my first rental property in Saginaw as an OOS invester from CA. 

But I don't think roommate income is a thing, and existing roommate income definitely isn't a thing if it's an apartment you're renting.I recommend you find a local mortgage broker who does conventional loans, give him/her a call, and ask to have a conversation about your borrowing limit *before* going through the pre-approval process.