For those who might consider discs: I suggested the TL 1000 rotors because they came very close to fitting an original Vincent hub. This means when you make an adapter to mount the rotor to the hub it is a small piece of aluminum and easy to make.
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It is fine to use any rotor you wish, but if the bolt circle of the rotor is large it means making a large adapter.
Also, if you are trying to do it on the cheap, I think Sam paid $250 on Ebay for the rotors, calipers with lines and master. It is probably a little more now, but I took a look on Ebay because another Vincent owner asked me and the prices are still pretty good. One caution, stick with the older calipers, which are Tokico. I found out that the new 6 pot Nissins do not work well because they are impossible to bleed. Many have switched to the old calipers. .........
David