The issue is that we can't find window guards that would work/fit these windows.  

Q2) Would there be an issue with this?

Or do you have any other good legal way of doing this?

Also, since it's illegal for 99% of Hard Money Loans to be used on a primary home then you could have legal recourse against your lender anyway. 

The basement, which is what I’m considering for a third unit, is about 1,000 sqft so I don’t think I would have any issues with the size.

I believe the legal structure, financing, properties, and path to living in the building all exist.

Wholesalers do not have a legal fiduciary duty to buyers to disclose all or even correct data to buyers so a lot of the information that you will need to obtain about a property will be your responsibility.

Tenant was in a MTM lease and would like to stay, but the seller provided a very bad review and had several issues to report about their experience with the tenant.Would appreciate any help on how to legally remove the tenant, along with tips to consider throughout the process.

My issue is that I come from a low income background and have fought my *** off, pardon my language to get to where I am now and comfortable.

Also you need to figure out how you intend to cover inevitable property damage done by guests but there are plenty of solutions for that in the marketplace where guests pay a flat fee per reservation in lieu of a deposit and you get covered for an assortment of potential issues (bad checks, credit card chargebacks, fraud, personal property damage, etc.)