I hope you get your spa/bath :-) Sounds wonderful!
Considering we have a full bath downstairs, and upstairs, a full bath, 3/4 bath, and half bath/mud room, I may just have to remodel one of those. There’s only 2 of us now.
When our daughters moved back and brought their kids, we used a little less than half the basement to add an apartment to our family room— so that’s when that bath went in. We could really have given a spa a lot of use then, but didn’t have the bucks to do it. LOL