Always glad to share what I know and support the investing community however I can.Hi Zach!

Overall, the structure of the home is fine, but the interior walls are extremely dirty — stained, covered in handprints, and generally neglected.I had to hire a handyman to repaint the entire interior, which cost me $2,200 (it's a 4 bed / 2 bath single-story home).

We found that insulating the walls of the crawl space with solid foam board insulation and keeping a small oscillating fan on at all times keeps the crawl space dry and comfy. 

who did the cabinet measurements, do you gave blocking in the walls to support the cabinets?

I’ve been learning a lot lately, but I’ve hit a few walls and could really use some input.I have my real estate license and have been practicing how to run CMAs and analyze properties.

.: Quote from @Greta Andrews: How do I know if a wall is load-bearing or not The general idea is that a load bearing wall runs perpendicular to the trusses it supports, but, it's a whole lot better to have a contractor look at your situation before you do any demo work. 

not sure if it has a quirky layout, some old houses do but maybe it needs a few behind the wall fixes (frozen pipes) and garbage disposal removal  will solve backups.

Expanding the duct work would have marginally heated and cooled those areas and the CA unit would have been borderline to support the additional areas.

Quote from @Aaron Raffaelli:  well i see what looks to be water in the basement, but even if its dry I would not spend the money to install steel beams to remove the jacks as it will be cost prohibitive and I do not think its really going to buy you anything as you will either need toinstall supports at exterior wall or cut into the exterior to then have the beams bear on those walls. 

They've already indicated that their kids will make a mess of the walls.