Well, as for me. I'd never make it to the bedroom underneath the trapdoor in the kitchen because I can't go up or down the stairway. I also wouldn't have enough room to move around with my walker much less the wheelchair; the kitchen is too small for me to even move around in. Then there's that living room area. I'd be scared to death that I might lose my balance while using the walker and fall into a window or either fall through the window! I'd also never make it into the bathroom!
The other problem would be getting inside the tiny house. It's nice and all for an able-bodied person, but it certainly wasn't made for someone with disabilities.
I could build a huge home or mansion with 2.9 million dollars where I live and have plenty left over. I'd have it made where I could go all over the place with the power chair, and also have one of those fancy Acorn stairlifts for the upstairs. I'd also have 2 huge bathrooms with extra wide doorways for my walker and those walk-in bathtubs.
Now that's what I'd do with 2.9 million dollars. Forget tiny home with windows all over the place!