I hate the look of the prefabs and worried about being able to find replacement doors, shelves, etc....Plan on installing granite in the kitchen

It can work that way, but you have to put diagonal shelves or a diagonal cupboard back in there. 

Houses in the lower 300k are flying off the shelve like hot baguettes and much so with multiple offers.

I'll admit I wasn't thinking to my self "I wonder how these tenants would perform in a worldwide pandemic situation" Your point is taken though, I suppose I share some onus here.I think the rest of your post is very interesting though, and even laden with some wisdom.

Interiors, I prefer wire shelves with a white coating on them instead of a wooden shelf.

Now I am approaching retirement age and still have my investment properties laden with mortgages.

I did NOT pay the price marked on shelves. 

You also need enough individual "personal products" storage areas in kitchen and baths...just identifiable shelves, drawers, or cabinets that you can label A,B,C,D, with each room (also labeled A,B,C,D) responsible for their specific storage spaces.

To be upfront and honest I am & will be a bit light on exact perfect detail and mechanics as 1) it is very detail laden, and 2) not really interested in broadcasting my hard earned "secret recipe" that have developed over the years. 

@Kirby DavisThese multis are flying off the shelves like hot cakes.