A big thanks from me! Supracer helped me onto JB as above.
Love the Rom, really smooth, batter ylife has def intitely got better. Only issue was no keyboard on the ROM so either stick one in the zip before flashing or load an apk ont oyour SD card ready for when you start JB for the first time.
Once on JB, I took the recovery.img from the Russian 4.0.4 ROM Supracer mentions above and installed it using Mobileuncle (from Google Play) and it was pretty straightforward.
I would say do it, its a fine ROM for day to day use.