I've thought about GM'ing a similar game in the past, but I wasn't even able to get a one-on-one version going.
I had proposed this initial thread to a potential partner. I thought it was what she wanted, but she ended up not going for it at all. Star Wars - The Erotic Adventures of a Hutt's Slave Girl
Once that didn't pan out, I gave up on the idea.
I like your idea for areas of the palace.
One complication could be that different players might like different kinds of RP even though they like the same setting. It could actually be the kind of game with threads in different sub-forums (Light, Bondage, Non-consensual or Extreme; Human or Exotic).
A "Guest Quarters" thread with willing slaves could be in a "Light: Humans" sub-forum.
The "Torture Chambers" thread or a "Jabba's Bedroom" thread could be in an "NC: Exotic" sub-forum.
A "Rancor Pit" thread, where slaves are raped and eaten by a monster, could be in the "Extreme" sub-forum.
In addition to finding a GM, I think you should make this an interest check for players. If there is not even potential for players playing characters, there's no game for the GM to master.
For me, I would love to play Jabba (or some other crime boss, Hutt or human), a Twi-lek advisor, Gammorean guards, a Rancor monster, and even Jabba's monkey-lizard court jester.
And I can go any and all levels of RP - light to extreme, human to exotic.
I'm interested in being a GM, but only if there are slave girls played by female players.