Life got a bit busy however I have spent a bit more time on this and finally have everything to a point where I think its ready to get a few sets printed at PCBCart and get some cases made.
Here is a render of the system.
The modules which are not attached still need their PCB's updating, however the concept is right, and you cant really tell from the images. There is still 1 case I need to make a front for also, that is the Ethernet/Bluetooth module - but I dont have CAD images of the WIZNET 812MJ or the Sena Bluetooth module, so its a little harder to design a front for as I dont know their exact size.
Anyway, 2 renders attached - I havent included them to show on the forum as they are larger size.
Cheers
James