I finally buckled up my balls and proceeded with flashing this...
but I lost CWM by flashing the .ftf file (I got my CWM previously from this kernel http://forum.xda-developers.com/show....php?t=1834129
), so eventually I guess - after replacing the kernel(?) I lose the CWM...
so I flashed that kernel with CWM by cobrato again to flash the ROM, it went well
even though I now have .55 ROM + Kernel + Root + CWM & everything, I realize that the kernel by cobrato is slightly older than the one posted by OP
cobrato's 6.1.A.2.55 Kernel Version:
SMP PREEMPT Mon July 30 13:29:45 2012
but OP's 6.1.A.2.55 Kernel Version is:
SMP PREEMPT Fri Oct 5 01:14:38 2012
so without hesitation, I flashed OP's .ftf file again, losing CWM but.. the kernel is newer....