Thanks for the responses fellas.
Had a good look at it today. Haven't seen it for a few months as I've been away and it's at the "frame builders" place. All the engine mounts are done and look great. The front mounts are removable. I really didn't want them welded as this has been a problamatic issue with other builds.
Looks like I'll be able to just manage with the standard fuel cock, but it's very close to the bleed bolt on the cylinder head.
But now I have another problem. The spark plug! That's going to to take a fair bit of remodelling on the underside of the tank to get enough clearance. Hope I don't eff it up!
Held up now what to do about radiators. The right looks fine with a 3mm washer on the bottom to pack it out a bit to clear the frame rail. But the left is a real headache. The standard 250f leftside is so long and hits the pipe in a big way. I was thinking of getting two right sides made in a 40mm core. Or, buy a set of original 500 rads and go from there. Any help or suggestions would be appreciated.
Cheers