I've got a pulley and cable end clamp sorted now - might need a longer cable since the frame is really rather large! I'll have a go setting it up this week hopefully.
I managed to get the rear rod brakes working nicely tonight. Unfortunately there is a tiny bit of hop in the wheel which makes the brakes catch once every revolution (I can't get rid of it by truing the wheel), but the brake still functions pretty well.
That front rod is still not going anywhere... I've tried "tapping" it with increasingly large hammers in addition to the oiling, but it looks increasingly like it will end up being a hacksaw job