Notes:
1. This Padmé from the 2008 TLC "Amidala Legacy" Evolutions set was also repacked in the TLC basic line as BD35 in 2009. This scene is also where the Flying Geonosian with Pod comes in handy.
2. Anakin from the Black Series line is an outstanding figure. Here, he can use his laser fly swatter to dispatch any number of Geonosian figures you have lying around.
3. The back of the Arena Playset has a retractable bridge, which seems to be intended for this moment.
4. The super gross 3-piece Geonosian Warrior works perfectly for when Anakin is slicing his way through the factory.
5. There are several good Geonosian Warrior figures. This one is from the Geonosian Arena Showdown 2-pack with Kit Fisto.
6. The various pieces of the droid assembly line work pretty nicely for the factory. You can make a nice long assembly line, including the small "stand" that comes with the otherwise inferior Saga 03-04 Padmé Amidala (Droid Factory Chase) figure.
7. C-3PO and R2-D2 from their Geonosis Arena Showdown 2-pack can't be beat for this...
8. ...although you will need a good R2 with jets to pull off this scene. The TLJ basic figure is the best one available.
9. It's not quite accurate to the film, but there is a piece on the assembly line that mimics the moment Anakin got stuck.
10. Again, the C-3PO from the 2-pack is great. However, if you want the machinery claw to actually hold the droid head, you'd need to sub in the magnetic Battle Droid head from the Saga deluxe set.
11. And here you're stuck using the C-3PO head and Battle Droid body from the previously mentioned Saga Deluxe set.
12. Take your pick of Geonosian figures. The ones from the Arena 2-packs work great, as do several others.
13. Lots of good Droidekas to choose from. The ones from the Arena 2-packs are excellent, as is the TAC version (minus the shield). Also you can use the Fett Legacy Jango, or the more purple Arena 2-pack figure.