Looking good mate. Good luck finding the spares.
As I've mentioned before I did some work experience BITD with Declan Hicks at Zero Components, and he used to have these Halson forks on his Pro-flex.
He then bought a Formula full suspension MTB. This had Formula (like Marzocchi DH3 or XC) forks and Formula hydraulic disc brakes front and rear. All exciting stuff back in 1993/4 (not sure
). I remember getting a warning when first riding the bike, that the front brake would throw me over the bars (I'd only used cantis up till then).
Anyway, he could never get the Formula forks to work properly or they broke, or something, but to cut a long story short (to late), he chopped the lower legs of the Halson forks and the Formulas then glued the Formula drop outs and lower legs to the Halson forks, thus equipping them with disc brakes.
I never rode them or heard how he got on.