My first 'build'

just get a complete rear wheel built, about £50, any decent bike shop providing they got the part can do it for you, depending on the crank and BB, that's all you need to do, as well as a new chain, I paid £100 for a complete rear wheel with fixed hubs, a bit more than usual but it's quite strong (and I feel confident with a stronger wheel).

I end up having to replace the whole BB and crank because it's kept coming loose and got unsafe, so a new Surgino messenger crank and BB, might as well go the whole new crank since the old one was 52, and I was riding 16-52.

I did that with my Peugeot, from this;

to this;

admittedly I wish i hasn't changed it as originally when I got it it was so stunning, it's in excellent condition that even the original tyres is still in excellent condition.

Puppies died. And I never thought I'd say that about a Peugeot.