Some Recent Mods and / or Techniques I've Explored
I wanted more panel space and found the add-on right sided molding from Aerotronics.

Russell LePre merged it onto the original, factory-supplied panel for me.
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I had a very hard time finding a silkscreener or engraver locally. The few I found wanted extravagant sums of money ($200) for printing up my panels. Surfing the web, I discovered BEL Papers in Florida who manufacture DIY water-slide decal paper for ink-jet or laser printers. This electrical sub-panel is 81 thou 6061T6 aluminum, sprayed with marine zinc chromate (from West Marine), then with Krylon Camo Khaki (which is actually a fair match for the light brown used in 747-400's, not washed out as above by my flash). After spraying, I baked the plate at 200 C for 15 minutes. Next the decals were created in my CAD software (VectorWorks) along with my metal cutting prints, and printed on my laser printer at 300 dpi, cut into strips and applied. After drying (3 h at 50 F (it is winter!)) I sprayed three light coats of Krylon Crystal Clear, Non-Yellowing gloss, and two final coats of Rustoleum Painter's Touch Matte Clear. The result seems to be fairly scratch resistant and hard. Not to mention very inexpensive - the Bel Decal paper is less than a dollar per 8.5 x 11" sheet and all of the displayed labels fit a single sheet with room to spare.
Here is an AOA I built myself for less than $5. of aluminum. Of course, the indicator in the cabin will run about $50, but this is far better than the astronomical prices charged for commercial, yet non-certificated indicators.

This particular probe may look familar to those who have researched the marketplace. I found the plans on the web. I will post the URL on the Europa Discussion List.
Here are my latest plans for my instrument panels

(Yes, I am buying my lottery tickets now so that I can afford this stuff)