Old school geek here with a love for mech keyboards.  Hopping in to hopefully get some questions  answered and show of planned mods 

I currently use a thermaltake poseidon Z on my main hom and work desktops but the key press is a little light.
I have a focus fk-2000 plus I found a year or two ago, but have never modified the AT to work with USB.
I just scored a Model M from a goodwill outlet store for about $3.  It was very dirty, but after a light cleaning it works great.  I do not know the exact model, as the sticker is gone from the bottom.  I will be posting somewhere to ask for ID help soon.  I plan to mode it with backlighting and fully refurbish it.