Bish,
I'll go with the group purchase approach, especially of we can save some $$. Since your local in Vernon, do you mind giving them a call and getting some pricing? If nothing more you should at least get a finders fee for bringing in our biz.
I would assume that the top guy would appreciate the assembly line approach to makeing 2-3 tops at once, although they may vary a lttle for each model of Cobra. It will also let him pratice on making your top first and mine last so he has perfected the job by the time he makes mine...he he he.
Let me know how you want to proceed or I'll ring you on the blower and we can talk off net.
Regards,
Kevin