The click-click sounds like a duff battery or solenoid; it may also be the starter brushes; though after standing awhile most likely the battery / solenoid.
You have doubts about the gearbox/clutch mounting and assembly. See if the engine turns over by hand. If it can be turned the clutch/gearbox is not binding. I wouldn't swing the engine other than by hand until this doubt is cleared.
Unless you from certain suburbs in Cape Town (which shall remain unnamed) please don't tow the vehicle up and down the road trying to start it - or pulling the gearbox "loose".