Any tips or advice for making a lock from scratch?

[muzzleloadingat18]

Pattern it after the best internals you can get. Get the best files, stones, and measuring instruments known to modern man, then take your time, take your time, take your time….

They didn't have the best files stones and measurement. Instruments 300 years ago. But it will definitely help. Slow and steady bit by bit is definitely the best way to do it.