I've been trying to research raw land loans and from the (granted few) banks I've spoken to, they will not loan on raw land-they recommend getting a personal loan out at a ridiculous rate 10-15% interest (they didn't run my credit, it was just an estimate for a personal loan, but I have very good credit-around 760 I believe), to cover the land and then refinance to a construction loan once there is a well and septic as I understand...So was wondering what other options I had as far as financing and what others have used?  

If you are looking for apartment buildings then you should be building relationships with real estate brokers that specialize in that.

A Solo 401(k) is not a WalMart discount special.  

USAA gives examples -- "pay off transition expenses, consolidate high-interest credit card debt or buy a reliable, economical car."

I do have fairly good credit, and plenty of sweat equity.

I suggest not to mess up your own credit and get evicted or unable to lease later.

. - Mortgage credit inquiries are not a concern, nor do they have a "hard" impact on your credit.

The key here is hiring a property manager that specializes in Section 8.

We have about 40-50K to invest from our HELOC, Line of Credit and 401K.

How I do it is through selective screening and I have been 100% successful.By instituting certain screening standards it will naturally eliminate the vast majority of non target applicants.For example young couples with children will generally have lower credit scores.