I work in commercial construction and typically an owner will request an owners manual with a list of product installations and their associated warranties.
I think it would be a great marketing strategy for rehabbers to create an owners manual that gives product descriptions of every new and updated items/equipment in the home with their warranties.
I think some homebuyers are wary about buying a rehabbed home, simply because they do not know if the project was done right. The manual could have a copy of the building permits pulled, photos of construction in progress and cut sheets of construction assemblies/standards used during the project.
For example, if a bathroom was remodeled, take pictures of the waterproofing membrane, provide product specifications, maybe even provide a mockup for the homeowner, so they know that everything was done right and by the book.
This will reassure a homeowner that you didn't just slap some lipstick on a pig to sell it to the first sucker.
I think this is a good business practice for any rehabber/remodeler who is remodeling per code and using best construction practices.
If you are doing things right show it off!
Let me know your thoughts.