I know mine are only standard 15" basketweaves style, but same theory..
The paint was very thin on mine - a good hard scrub would take it down to primer in places, so I decided to go for te polished lip & dark centres..
Started with Nitromors (paint stripper), got all the paint & primer off the lips.. unfortunately the rims are a 'crinkle' finish under the paint, so out with the 120 grit paper to smooth them down.. This was the hardest part of the whole process - more just time consuming than real hard, but it'l give your arms a good workout!

Once all the 'crinkle' was gone, I used 400 grit wet, to remove the harsh sandpaper scratches.
After the 400 grit, I used a Brillo pad (soapy fine wire wool, for doing crusty pots n pans, dunno if you yanks have them or not!).
The finish you see in the pic is straight from the brillo pad (ok, so I masked & sprayed the centres too in dark grey metallic), it's pretty shiny & scratch free but using some polishing compound on them willo be the finishing shine I think, just to take out the final very fine scratches..
Each wheel took me around 5 hours start to finish (so far), including waiting for the paint stripper to do its stuff..
Hope this helps!