Soarer's Converter

Yesterday, I purchased an ATmega32U4 to build Soarer's converter for my IBM M Keyboard. I'll be mostly following this guide to do the conversion, as Soarer used a Teensy 2.0 in his original design, and this guide uses the same one I've ordered. I'm still debating on whether to do the conversion internally or externally. If I do it externally, I'll likely get a low-profile case that I can attach to the keyboard where the Num, Caps, and Scroll lock LEDs would normally be so that I can add those. I'll also likely either map some of the extra keys, or use optional external buttons, to quickly remap the keyboard for Linux, Windows, and Mac usage, and possibly emulator usage as well. I'd love to dye the keycaps black and paint the frame black as well, but I'm not sure how to re-do the lettering on the keys without them completely wearing out. Unicomp has some cool keycaps, but nothing in black and, sadly, it appears the largest set the sell is 104 keys, and there are no 122-key sets.