Cool, another one!
Spectacular work with the CF! It definately keeps with Chapman's no weight philosophy. The engine looks great also. I would have recommended converting it to a Crossflow (essentially just swapping the positions of the carbs and spark plugs) as it's a more modern and powerful configuration, and is much more likely to be seen in a modern 7- but as it's already painted up so nicely it may not be worth the surgery.
As for wiring, there's not much you need to add to a Sidevalve or Crossflow Kent. You've got the plug wires and fuel line from the regulator to the carbs. Add two coolant lines to the radiator, the clutch cable from the master to the slave on the lower left side of the flywheel bell, an ignition coil and maybe the battery cable to the starter and that should be plenty.