Looks good. I'd say Flat or Wrinkle Black and Polished, Clear PC for the overlay. I' would think grooves, either etched or pressed in, on the underside to carry through the look of the ribbed section. If not, then I'd say it's a go anyway.

With regards to the greeblies; Recharge Port opposite the Activation Switch? If the Blade Retention Screw is where Crystal thinks it is (I interpret it as such too), it will have to be moved to the Blade Holder. It looks like you have a Guarded Switch near the hilt, 90 degrees from the Cover Tec Knob. If so, is it there for more than asthetics? It looks like you only have 2 Button Head Allen Screw on the overlay parts from what I can tell. You might want to add a few more to ensure security of the pieces.

Other than that...Enjoy the build!