He fell again this morning, going from the walker to the chair. Looks like it wasn't a bad fall, just some bruising. He is doing much better compared to two weeks ago. Thank you for all the well wishes.
I wish you and your parents nothing but the best.
However, and I don't mean to be a downer, but I've been in your shoes with my own father (who lived with us for 4 years). I don't mean to sound pessimistic, but from what I've read of your father, at this point, there is no disgrace in actually planning for the worst.
I sincerely hope your father gets to use the remarkable bathroom you've built for him, but you also have to understand that there could be a chance he will never use it.
I always plan for worst case, my nature, so forgive me...
If your father never gets to use his house (or perhaps for a short time), for the time effort and money put into the bathroom, how long will your mother be able to use the house?
My own mom died in 2002. My dad didn't move into with us until 16 years later, and the only reason he did was because he fractured his back and he came to the understanding that he couldn't function by himself anymore in a house that only he lived in.
With your skill set (far better than mine), I'd look to adding onto your own home and have your parents live with you, so your family can help them.
Fatjay, and I mean this with all sincerity, you're a better son than I, so take my honest opinion with a grain of salt.