first of all, great work DooMLoRD... thank you very much. I could finally move to JB after weeks of dreaming about having enough time to flash it
and I have also downloaded sony's alpha sources (thanks to sony again for being so developer friendly by the way)
I got wifi working. according to the dmesg output PIL loading was the problem and I replaced the firmware files (only /system/etc/firmware/wcnss* are enough) with the ones on the latest ICS ROM.
I have also cherrypicked codeworkx prima_legacy commit from cm10.1 repo just to make sure that I don't have any module loading issue with the precompiled module binary available in /system/lib/modules
in the ramfs I mounted tempfs to /system/lib/modules and linked the files to /lib/modules/*.ko which are compiled.
I cannot pack & upload any patch now because all the work is left at my office, but I will do that tomorrow if DooMLoRD or anybody else doesn't publish any patch.