Ok, so use cellulose would be probably closest to the authentic materials, as the bike is 27. By Scott technicalities factory started to use cellulose in about 29-30. Not far away.
As much as I know from Velocette guys, it is possible to ask individual if they could make a bike. Is this technology closer to original stove enamel used between the wars (as I would expect), or closer to the modern stove enamels? Just to know. It’s a bit confusing for me, as I´m slowly getting names of technologies in English.
Thanks a lot,
Martin