DeXiTroN there is a bellcrank that is supposed to be mounted in that box, if you look there is an 8mm hole for the bolt on the right side of it, it bolts through vertically.
See your photo belw;
https://ibb.co/YX10zX8It connects the rod to the horse shoe, thats why you cannot fathom how it works as its not fitted.
Also the mechanism below;
https://ibb.co/Lpt4C3THas to be fitted to the bulkhead first, in the engine bay. The part where your right foot is (in the photo) fits to the drivers side, the pedal box is secured to studs that protrude through on the inside.
The servo/master studs pass through it on the opposite end and sandwhiches it to the bulkhead.
For some reason you have wiring coming out of the heater hose hole - its that diagonal slot on the bulkhead;
https://ibb.co/dcxyfMkAnd next to it on the left you have a gromet with a wire that i am sure should not be there as it will be trapped under the metal plate of the transfer.
Look at the diagonal slot on the transfer, it should line up with the slot on the bulkhead.
lovely paint job by the way.