Yep, that's certainly a clever way to go about getting a changing table
Me and my Mommy have been talking about cost-effective ways to get a nursery for yours truly going sometime down the line and a massage table is definitely something we are considering for a change table ☺
Another possible solution to having a custom made changing table would be buying a medical examination table, some of them look almost identical to actual changing tables, just upscaled for adults, obviously
I know of some ABs online who got medical examination tables second-hand and painted them afterwards to make them look more like nursery change tables
Mommy and I have medical examination tables on a list of change table candidates as well
A massage table is likely the cheaper option, but considering how much a custom job would run, if you have money to burn, the medical examination table looks more like a proper changing table
As a side note, custom made change-tables in our community aren't offered that much. High-chairs and cribs seem to be the most common pieces of AB furniture you can get custom made, so I'm glad there are some decent alternatives out there for other nursery essentials