1975 , I used stamped Prugnut (or what ever they were called) lugs BB & fork crown were cast .
Columbus Aelle Tube and Brass clean metal thoroughly before fluxing
I still have the frame .. type : Touring , reason to not just buy one ?
made a longer top tube so Toeclips and Front Mudguards got along with each other ..
Mafac cantilevers .. Adjustment 1 was where the bosses were put on the Frame.