My desk space is very limited so I am building a monitor stand

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My desk space is very limited so I am building a monitor stand that will allow me to place the keyboard under the monitor and still use it comfortably. However I'm also thinking of making some sort of heater to put inside of it, as whenever the weather is cold my hands always go numb, and any gloves thick enough to keep my hands warm would impede my ability to use my keyboard or mouse. Any ideas how I would accomplish this?
I'm putting some LEDs on the underside pointing down to illuminate the keyboard, so I'm going to get a big sheet of felt to put under the keyboard to reduce glare from the desk as it's fairly shiny. I was thinking of perhaps using excess felt to insulate the inside and stick one of those zippo hand warmers inside. However I think the opening on the front would be too wide and would let any warm air out. I don't want to put a curtain or anything over it either, I don't have good sensitivity in my fingers at the best of times so I can't touch type. I need the keyboard to be visible.