If you are financing the purchase, the lender will also provide protection, you will get an inspection done to protect you and so on.

Have been working with a lender the last few months.

If I understand your situation correctly, you could structure a Tenancy In Common (TIC) deal where each of the separate LLCs owns an undivided interest in the replacement property, as tenants in common.These deals need to be structured properly and you need to have an attorney familiar with 1031 exchanges involved to make sure it's done properly.Also, if there is a lender involved, that can complicate the matter as well.It's definitely doable, if you have the right professional help while you're doing it.Feel free to write if you have any questions about this.

I am seeking a private loan to facilitate the process.

There are lenders who will do vacant land.

Because you’re getting within 12 months of leaving the military, many lenders may want to see info on your next job for income.In addition to the VA loan, check out the NACA program at NACA.com.There are many lenders.

The ADU does not have a private entrance; you enter on the side of the SFH and they both share the same back yard.It is at the top of our budget already and needs potential mini-split HVAC added to it to bring highest Air Bnb value.

Because you are buying in NV you will need to look for local lenders, most nation wide commercial lenders won't lend in the state. 

If you have the right connections, you could find a local private lender who will lend you based on the (value of) the asset but the conditions won't be better than those of the banks. 

I meet some of my most influential connections at these meetups including fellow investors, mentors, lenders, contractors etc.