Sulaco, there's not a lot of point in lacing a road/track hub to a MTB rim (unless you want fixed-gear, of course). 80s/early 90s MTB hubs were spaced 130mm too - essentially they are completely interchangeable with road hubs.
If you want a 26" wheelset, I would get a late 80s/early 90s MTB wheelset (check retrobike), with either screw-on freewheel or freehub, because they are spaced 130mm. Your old road frame will be 126 or 130mm (unless it's really old in which case it'll be 120mm) so it'll either just plop straight in, or it'll need the minimum of cold-setting - and then you can use your existing SS conversion kit. And then you get all the benefits of a freehub, and it'll only cost about fifty quid for a decent used wheelset. Cheaper than buying a track hub, 26" rim, spokes, and sprocket/freewheel. And no need for any of that wheelbuilding malarkey.
Sulaco, there's not a lot of point in lacing a road/track hub to a MTB rim (unless you want fixed-gear, of course). 80s/early 90s MTB hubs were spaced 130mm too - essentially they are completely interchangeable with road hubs.
If you want a 26" wheelset, I would get a late 80s/early 90s MTB wheelset (check retrobike), with either screw-on freewheel or freehub, because they are spaced 130mm. Your old road frame will be 126 or 130mm (unless it's really old in which case it'll be 120mm) so it'll either just plop straight in, or it'll need the minimum of cold-setting - and then you can use your existing SS conversion kit. And then you get all the benefits of a freehub, and it'll only cost about fifty quid for a decent used wheelset. Cheaper than buying a track hub, 26" rim, spokes, and sprocket/freewheel. And no need for any of that wheelbuilding malarkey.