Just received my control panel overlay (ended up getting it done at Game on Grafix), and it looks great. This just about finishes things off
For controls I have used:
Servo-Stik (with longer shaft, and Seimitsu dust washer)
GGG ClassX True-Leaf Pro buttons
Atari start buttons with repro cones
Cheap (£5) SNES-style USB joypad hack
Gave it a good play test on Saturday night and am very happy with it. I hadn't used a Servo-Stik before and so far it is proving to be great. Likewise the True-Leaf buttons, I love them so far, great for rapid fire games.
Will try to take some decent photos of the finished article at some point.