Inigo, Orange71 and reanimation, thanks for the guidance. I've had a look at the rigid forks and they're very tempting -- they're cheap and would probably reduce the weight of my bike. I think the steerer tube on my existing forks is about 140mm long, so those available on eBay might be a bit too long for my frame. (?)
It seems to me that having the threaded headset is reducing my options. If I could replace that with an "Aheadset" then I would have much more choice, no?
As for the fitness, yes, it's all about sticking with it. I was really motivated when I saw a post on RB from someone who had built a bike for their friend and that friend had gone on to lose 3 stones (19kg) in weight thanks to months of cycling.
It seems to me that having the threaded headset is reducing my options. If I could replace that with an "Aheadset" then I would have much more choice, no?
As for the fitness, yes, it's all about sticking with it. I was really motivated when I saw a post on RB from someone who had built a bike for their friend and that friend had gone on to lose 3 stones (19kg) in weight thanks to months of cycling.