I fitted a headtube/handlebar water bottle cage to my path frame that i took and rode in Scotland, as that is all I had at the time.
I do have a few downtube cages but they were attached to other bikes.
an equivalently aged downtube cage would probably have cost a lot more especially trying to source at short notice, I much prefer the downtube versions as they are much easier to fit and it doesn't make for such a cluttered and busy cockpit.
Cluttered cockpit with modern and essential paraphernalia.
The cage is attached via jubilee clips to the handlebars which hold the cage tight but seem to get in the way of your hands and do not make for a comfortable riding position.
Double cage with the same jubilee attachment method.
I did away with the jubilee clips and held the cage in place using cotton bar tape. Wrapped the cotton with string to hold it in place and then shellacked the lot. I was worried it might fall to bits on the road but its held up well.
I love using the shellac as it makes the tape waterproof and i just find the feel warm and comfortable.
The only down side is that you always end up with the same colour tape once its painted. The bar tape here was a light blue originally.