Great work there Andy. I like the wiring bundle, looks the biz, and should look just right when looking doen into the cockpit. Vic is right about the copper wire - the stuff used for jewellery etc is as thin as the fishing line, and has the advantage of remaining pliable once glued. Yiou should be able to get some from craft shops; sometimes it's in kits with other bits and pieces, some of which can be uaseful for other modelling needs, whilst the rest are - well, bin 'em!!
You can also find short lengths on old PCB pieces from transistor radios etc, and slightly heavier gauge from the multi-core telephone extension cables can be useful. the latter have various coloured sleeves, which can be handy, but when the sleeve is stripped off, the wire itself is very fine and pliable.