I quite Like House Flipper and try creating new styles and doing something special. Then once it sold .. it's like it's gone. Which is a bit disappointing.

I'd Love to be able to revisit or take a tour of my completed houses. Also to get an inspiration to improve on what I did last time by seeing what I did last time. To be able to save flip like a gif save file of a house we have flipped.

Imagine a quick camera tour of a house you've worked on as a record of your houses. I'd love it if there was a way we could record a build before selling it.

Hi, you dont have to sell it :) keep it if you love it so much. I do.
By the house again and redo different.
Once you own the HGTV dlc you get the before and after pictures,
https://store.steampowered.com/app/1126050/House_Flipper__HGTV_DLC/

To record a video like walk through the house use a screen recorder like OBS Studio is free or Bandicam
https://obsproject.com/
Bandicam
https://www.bandicam.com/
There are many others but those 2 will do what you want.