Painted the calipers today and they came out OK. Not exactly blingy looking but it makes them presentable before I can go upgrading them in due course
(I must remember my adage was KISS)
I will weigh them before I put them back on the car, just to compare against the lighter options and to tweak the nose of the "upgraditus" demon 
As it is, they're now ready to fit. Also, as they work fine there's no point replacing them (yet). Another positive step towards a roadworthy car!

I also cut a 40mm hole, fitted the wee cooling fan to the JAW box and did a minor bit of rewiring and tidying of cables. I just need some bigger heatshrink and a cable strain relief and it'll be complete. Just need a car for it now :-)