Nice!
There's a member here named Phil (site name Rms37? I think) who seems to be very knowledgeable when it comes to the CWC frame especially... maybe he could help you? He seems like a really nice guy... I see him posting helpful info on this forum and theCABE quite often.
EDIT: I just searched through, and I do have is name right... specifically, it is "rms37"
Hope you can figure the year out!