That is an industry wide safety margin to help you survive.

Sometimes the best photo that's the front the house (definitely the case with your photos), sometimes it's a kitchen, sometimes it's a wide angle shot of an open space with gleaming.  

For an accent wall We just do a darker grey and some 8” wide white trim on both sidesEasy, cheap and cheap and easy to fix if a tenant damages it 

I am also passionate about real estate (both investing and designing/renovating), I also am driven to accomplish goals and to succeed, I also have continued investing somewhat even though we don't really need the money anymore - in fact we just finished our biggest deal to date by far and from afar (thank goodness the one benefit covid provided - the wide acceptance of the digital notary).To be clear - my assumption isn't actually that everyone hates doing this, or even that everyone wants to exit their business (and I'm certainly not assuming that everyone would choose to live our same lifestyle given the opportunity)...

We live in a prestigious lake area, homes ranging  $300k-millions and we’re the only Double wide M/H in the area.Been listed on the MLS for 6 wks. with only 3 showings.

Another reason the range is so wide is because contractors wont really know what kind of work this project will entail until they see behind the walls and look into plumbing, moisture issues, electrical, foundation, etc. 

And is there something that is already being widely used? 

If you go into this with your eyes wide open, stop paying for inspectors.

There teachings are quite wide to make you understand what type of investment you prefer.

Yout get maybe 20-30% more in rent than LTR, but you also get around the STR laws so your search area is wide open.Just some thoughts.