The Master weapon switch has an LED inside and it can illuminate, it is done by using a small relay, and supplied by 5 volts (Also from 'Rapid' electronics). Only good if you have a 5 volt supply handy of course.
This one does not actually work yet, but I have a working one on a friends cockpit to good effect and we have also set up the cockpit lights to work in the same way using a relay contact as the input to the Leo Bodner card.
The perspex was done by these people www.plasticsheets.com they also do 'tinted' colours and various thickness as well. I used a light grey tinted sheet and the graphic was also printed out in grey. I did get a dark grey tint as well but this was too dark for use as a front panel, you can not see through it at all but light grey is just right.