Seems like something of this caliber would be hard to find because it would still be difficult to transport since you'd obviously want it to hold up to playtime and be sturdy. Don't want anyone getting hurt. Modifying a massage table sounds fun and interesting and to keep it discreet you could purchase or have a special cover bag made for it. I don't know what your table is made from but I have seen some sturdy light weight aluminum tables used for bondage play online. I just happened across it one day so not sure where to direct you but perhaps type in some keywords in Google search. Good luck and do share when you find what works, I'd be interested in seeing what you come up with or find.