Disc brakes

[Scarfacexxx08]

I have a cannondale frame I'm looking to build up, and giving serious thought about wanting to add disc brakes. A quick Google search brought up a few options but nor sure they would work too well. The other thought is wielding but no idea where would do it. Any thoughts? Has anyone tried the bolt ons?

 

[Southville Hop]

https://www.sjscycles.co.uk/brakes/...s-bike-with-current-disc-brake-system-dmuni/?
I’ve used a similar A2Z adapter on a bike many years ago and it worked well. Recommended