Hello,
I've been working on this control panel and have taken some pretty poor quality shots with my phone if anyone is interested.
Made a box out of mdf fixing the corners with glue and three pieces of dowel and sanded. Drilled the holes for trackball and buttons:

I got a perspex sheet drilled for the overlay... it fits like a glove but the guys that did it for me drilled the four holes around the trackball also. I didn't really want this as I had countersunk them on the wood already and had intended to obscure the heads under the artwork for a cleaner finish. Oh well... i'm gonna make do...

painted the box (this is after the first coat, i did another 5 sanding between each one)

checked artwork and lay perspex on top

I clamped the perspex on and used a sharp craft knife to cut out the buttons holes from the artwork and trim the edges so it fits flush with the edge of the perspex.

you can see the holes for the joys that i haven't fitted yet, and also the black bolt heads around the trackball that were not intended to be there... but it looks ok. It's a lot more red in real life and doesn't look so orangey. I guess my n95 8gb camera isn't as good as I thought it was hehe.

im gonna stick the joys in when I get a chance and fire it up. The prototype i made (basically this without the trackball, art and perspex) works great so I don't anticipate any probs.