Note: I'm self educating on Commercial Real Estate deal analysis, so pardon the elementary question(s) (I'm sure there will be more!)

I have self-educated on Florida tax liens and tax deeds all online.

Thanks for the words of confidence, @Dmitriy Fomichenko.

Interior Doors: Pretty self explanatory, I have interior doors, hardware and Misc.For my house I carried $800.00.9.) 

Self-storage facilities seem to be booming everywhere these days, but I'm not sure the population of this county would support something like that. 

Life is truly a self fulfilling prophecy .

I love being a private lender but the fact that it simply increases my taxable income makes me consider shifting some of my note portfolio to multi-family perhaps...You might find this discussion beneficial where similar question is raised: https://www.biggerpockets.com/forums/51/topics/604...Owning notes in your retirement account (especially self-directed Roth IRA or Roth Solo 401k) is ideal since you can have tax-free income for the rest of your life if you utilize one of these vehicles. 

Can I use my self directed IRA funds as a down payment on a vacation rental investment property?

You should always include it as part of your analysis even if you plan to self manage.  

Based on that experience, I would go out on a limb to guess that most of the concern is a result of either the bank being uncomfortable with lending to an LP if they aren't well-versed in it and thus cannot confidently assess the risk, or (2) banks want personal guarantees from limited or general partners as the investment vehicle is generally single-purpose and would be hard to recover against.