Cabin lights were fitted down the centre of the roof, and were dome shaped. there were, I think, six of these, each approximately six inches in diameter, and were diffused. They wouldn't normally be used on operations, for obvious reasons, but if they were switched on, they would normally be fitted with a dim blue bulb.
The jump lights were mounted on a rectangular box, about two inches deep, four wide and eight high, just to the right (forward) of the door frame, at eye level. The red 'Stand By' light was on the top of the front face of the 'box', with the green 'Go' or 'Jump' lamp beneath, both approximately three inches in diameter, and dome shaped.
Depending on the unit concerned, there was sometimes a second set of these lamps, slightly smaller in diameter, mounted directly above the door.
Hope this helps a bit, but someone might have more detailed info and/or pictures or drawings.