Any other surprises such as higher tax rates, preservation requirements, flood insurance, etc?

I think you hit the nail on the head when you mentioned looking to "value add." 

I took extensive video and pictures when i moved as the house was not, to most people in move in condition, obviously cleaned but very cheap and very old carpet, large areas of rooms that weren't entirely painted weird hardware sticking out of walls, screw holes or remaining screws and nails, several patched but not painted areas, tons of areas with drawing, water, oil marks on the walls (from a centimeter to 1 foot) etc etc! 

If you see nail heads in the long edge grooves you’re likely out of luck.

I'm going to sand and paint the current kitchen cabinets because they are in great shape and could save a lot on my budget by preserving the current ones. 

One of the biggest advantages of mobile home park investing is time.Even more impactful than in other real estate classes because MHPs are the most effective way to landbank for the future.It is often overlooked but where else can you put money that gives a strong cash flow opportunity while preserving the land for future development opportunities?

As with any type of structure check the door and window openings for sagging and major cracks, older homes did not use metal hangers for support oftentimes these structural members were simply held together with a few nails that have worked themselves loose over time.

Their insights highlight the necessity for a careful approach to vapor barriers and insulation, emphasizing compatibility with the building's original design and moisture management needs.Here's the plan:Ceilings/Attic Floors: Elevate insulation to R-38 or above, incorporating vapor retarder paint or smart vapor retarders for optimal moisture management.Walls: Boost insulation to R-13 or more, utilizing smart vapor retarders or materials with adjustable permeability.Basements, Crawl Spaces: Increase insulation to R-19, targeting ground moisture and internal humidity control.Materials: Opt for eco-friendly, breathable insulation and vapor barrier materials that preserve the building's historic charm.This meticulous approach elevates the property's energy efficiency and moisture management, enhancing its value and ensuring a profitable return without compromising its architectural integrity.I'd like to hear your thoughts, experiences, or any advice you might have on integrating vapor barriers and insulation in renovating historic properties.

If I were to hire someone to clear the brush, would that qualify as a preservation improvement?

Again, it is more about preserving your investment for a few short months until this is over.