Would anyone have some suggestions on a smart lock which would fit this type of door? 

Your smart for planning on building your team early.

You’re probably thinking, I don’t know this person so why should I get involved… just remember that we’d both be in the same boat, we both have to trust and respect one another, but read to the end, and learn more about me.I was born and raised in San Jose, California by my beautiful, wickedly smart and fiercely independent single mother.

A smart seller should only seller-finance to someone with good credit, adequate reserves, a nice down payment etc. and underwrite the deal like a normal bank would, but I've been seeing more and more situations where unqualified buyers are acquiring properties this way. 

I concur with what Joia said here, definitely smart going with the 2-4 small multi-family route and house hacking your first investment.

(parents make $200K) student ai A+++ and then I think the grade point owes...joking shes that smart in school. but it look s like home mortgage 5% and 5 years in 6 month payments

If you click on the magnifying glass in the upper corner and type accounting you’ll see other times this has been brought up and the answers given. 

Like others have mentioned this is harder than ever with interest rates where they are, but you'll also be able to refinance when interest rates drop.  12 months later (Again this is a rose-colored glasses situation) you'll have access to another 50k from your TSP and potentially a HELOC from the property you purchased, now you have a pile of cash you can use to buy other BRRRRs.

You can always push back on appraisals, which is always smart in my mind. 

That's a smart decision.