Looks pretty close to my colour. We started with a GM blue, added a little pearl and metallic. Post some pics of the finished product !
GM do a very similar colour, Ming Blue Pearl Metallic.
I prefer the Merc colour as it seems to have more blue to it.
Plus it's off the shelf.
I didn't want to get involved with 'paint alchemy!'

Be patient!

The final paint job's a little way off yet!
(Hey britcon,you even spelt colour the right way....... ;))