I'm lost by your question but you want to focus on the income method to determine value.

And, naturally, there will be more paperwork, since you're starting from scratch in the eyes of that new lender (who does not care about your 40 day old pay-stubs, etc, they want the most recent ones).

Sure Yusuf, that's a very tried and true method of real estate investing that has done wonders for a lot of people.

I want to leave the method ( flip, brrrr, buy and hold, ect...) open to the specific property and circumstances. 

I want to make sure I have current info.As the title said I am looking for the best method of converting my 401K for Real Estate investing, SDIRA LLC, Texas SDIRA Series LLC or Solo 401K.From everything I have read I am leaning toward the Series LLC but it seems the Solo 401K has some advantages although I am not sure about liability protection. 

I think it’s pretty dangerous to start generalizing these things due to the exponential nature of what a spreadsheet calculation mistake could cost you.If you already have a process in place it’s pretty easy to see what it would look like at different scales but that needs to be defined from the beginning.

I have an investor I'm working with to help locate a property to use the BRRRR method.

Now a toilet clog or something of that nature would be more suitable.

If your ultimate goal is to build a portfolio then the BRRRR method is the way to go.

It naturally makes it less competitive.