I made a mock 2-person Cirriform DW in my living room like KT suggested. One obvious thing is that it’s quite narrow.
Int. width at ground level: 46″ (head) 43″ (foot)
Int. width at top of tub: 51″ (head) 48″ (foot)
The two pads I have are 50″ wide, so they can’t even lay flat in the tub. That might be ok; my wife and I are likely to only go out for a night or two at a time together; otherwise, I’d use it alone. But that has me a bit concerned.