The FK-100 (actually an F28 Mk100, on paper) had one set of TLs, central on the pedestal - and they were a long way away from the pilot!
It also strikes me that the original F28 flight deck is a model of simplicity and has acres of free space, also a hallmark of the wonderful FK-100.
The letter box, by the way, is to enable the First Officer to post the signed loadsheet to the despatcher or pushback crew, before departure but after the stairs are removed. It has a chute down to an outlet on the left side of the nose.