I have recently inherited some of these CCT's from my father which I plan on doing the same thing as you so will watch this thread with interest, looks great so far!
How did you obtain the parts from ABS? Do they have a website or anything? Do you know if they attend any shows such as warley coming up?
With mine I had planned on getting some flush glazing, I think shawplan do some, and possibly fit some sprung w irons, if I could figure out which type to use, and fit new axle guards/springs. Maybe also fit some cast buffers, again if I knew which ones to get!
And of course a repaint into BR blue.
Keep up the good work!