I tried to call Mathews back several months ago. no answered calls, no return calls after 2 attempts. Shortly after that I installed a set of metal fabricated letters for another sign company and they were from Mathews, the quality of these letters were absolute crap. They may have been great for others but something fell thru the cracks.
As far as halo lighting some channel letters i would have never used any Gemini product for that. The letters do have their place dont get me wrong but not for halo lighting I would have them fabricated and yes I would drill out each letter for the wiring. you cant conceal this wiring for the outside of the lettering