I think it’s awesome that you decided to share more about this unusual place, @Tushar18 . Places like that add a lot of value to any travel experience.
Actually, the heating and musical toilet seats are common for Japanese households and public restrooms. 
But your question made me what to check if there’s a toilet museum in Japan, too. It turned out that there is - the TOTO Museum. Unlike the Sulabh Toilet Museum, however, the TOTO Museum displays only toilets produced by the Toto company.
What did the sample toilets in the museum courtyard look like? Was there any piping?
I’m happy you felt a sense of satisfaction when you drew and presented your plan about accessible toilets. I’m keeping my fingers cross you find a way to turn the drawbacks into advantages if it’s your goal!