It's not optional.This is a good start: https://www.mass.gov/the-massachusetts-lead-lawIt literally takes a child ingesting a chip of lead paint the size of a quarter to cause actual brain damage. 

It sounds to me like what you're are putting together is a syndication; many real estate entrepreneurs are unnecessarily afraid of syndicating a deal and that's probably due to the same factors anybody is afraid of anything; lack of understanding, and experience.

i like the idea of sticking him with the costs of court because he is making life unnecessarily difficult.

And by creating LLC for your Solo 401k you are gaining checkbook control, which will make management your investment a lot easier.HOWEVER, I see that you are unnecessarily over-complicated your set up by using Advanta, which is a Third Party Administrator, not a custodian.

Will cost lots of money and indigestion unnecessarily your way at your scale IMO.

Risk mitigation is by no means the least of the advantages of professional management (with the emphasis on professional).By doing it this way, it's my assessment that an encumbering LLC structure is not only unneeded, but also a very inefficient and unnecessarily costly means of holding rental real estate for an individual like myself.

Do you think I am along the right track  with this or I am unnecessarily over complicating things?!

 I have tens of thousands of dollars in yearly rental expenses that I'd like to put on my business credit card to earn cash back, but the accounting process in Buildium seems unnecessarily complex. 

While I agree your contractors are trusted members of your team, you unnecessarily expose yourself to risk when you put that much trust in them.Regarding the point about contractors buying cheaper through Stock and supply houses rather than you going to home depot, that's a simple problem to solve.

There's an opportunity cost when unnecessarily leveraging (the interest you're paying)... you simply have to use that capital in a way that generates a greater return.