Apologies for taking so long to reply to your lovely comments. All the feedback received from you learned folk (both praise and criticism) is very much appreciated and taken on-board to improve my capture and processing for the images which follow.
I have certainly been very encouraged to discover the extent to which the addition of regulated temperature control turns the humble DSLR into a very capable imaging tool. Without the cooling I doubt I would be able to extract the faint details shown here and in other recent images. It's not all smooth sailing however as my dew control is not really effective, and my modded cooled cameras have a tendency to malfunction when operating at regulated temps close to (or below) the ambient dew point. I have been wondering about how to install a dessicant pouch into the camera to help control this, but that is probably a discussion for another thread.