Just bought these lovely wooden side panels for the Rytm, they also fit A4, octatrak and MD. Just wanted to mention them on here because they really improve the ergonomics and look great. I was starting to get a bad back spending hours hunched over but now the Rytm is at a perfect angle to work at comfortably. I was initially concerned about covering the side vents but the official word from Elektron is that this is fine.
http://pages.ebay.com/link/?nav=item.view&alt=web&id=151442061028