+1 for Simon Firth. I had him build my Brooks B678 (chromed B68 frame that I supplied, honey B67 leather, large copper rivets). For a common saddle like a B17, It may be a wash as far as cost goes. But if you want to customize it (like large copper rivets), this is the only way to go. I probably have $300+ in mine, but I bought all of the parts separately, and triple chrome plating isn't cheap. I can also understand wanting to keep as much of the original saddle as possible. I still have the original 1973 Brooks Professional (small copper rivets, chrome frame) that came on my Paramount. Someday it will be sent to Simon.
Laing