I'm not sure I have the skill sets you need for this type of project, I have extensive experience in leatherworking with belts and horse tack. In the past I have made collars for large dogs, ie: Shepards, and Akidas. I made them to the specs of the customers. I searched the net for brass conchos, but failed to find any . The only thing I found available are those with antique silver finishes in various styles and shapes. Let me know what you think. Sorry I have no pictures at this time as I have recently returned to Leather after a 10 year absence.
If my qualifications are not what you are looking for . Please be so kind to let me know. In any case good luck with your search
Sincerely
C B Finger