The handbrake cable and control were assembled and mounted today, along with the pedal box.
The worst part of the whole operation was discovering that the buttress under the driver's side, which is a Peugeot original, has a captive stud that is about 6 mm too short to hold the metal handbrake sheath under the driver's floor. So I had to remove the brass clamp and reduce its thickness by about 3 mm on both sides using a Dremel and files (good old engineering on this part, with massive redundancy) in order to get it on.
The pedal box was dead easy of course and the stuff under the car was as well.