I just got another battery as they are half price  ;D

I thought about the 5V as I was reading through something else and realised I'd need 2.

I have a plan coming together and as parts arrive in the post I will check fit / see how much space I have, particularly with LEDs I was thinking of using a multicolour with fibre-optics to make a flashing console effect thus reducing the actual LED count.

Thanks for the info - I can't wait for my stuff to arrive so I can give it a go!