Vintage Peugeot conversion help and tips please

...my only real query is the cranks and which ones will fit etc ? any help appreciated, thanks
It looks like a square taper crank, rather than anything more modern, so you'll have plenty of choice.

Which cranks will give you the right chain line, will depend on the length of the spindle: you need to measure that.

Having said that, you can get a new BB for around £20 (either loose bearing or sealed cartridge).

Have a look upthread, where I posted some links to a site with details about dating old Pugs and what threads Peugeot used and when.

Most likely an English BB, but double check before buying a new one.