Out of curiosity, how thick of a machine would you be willing to accept? The Toughbooks are around two inches deep and still require professional laptop industr

Out of curiosity, how thick of a machine would you be willing to accept? The Toughbooks are around two inches deep and still require professional laptop industry component packing knowledge to fit everything, but doubling that dimension yields lots of DIY flexibility, and Pelican makes cases of many sizes. Also, what kind of keyboard would you prefer? I havebecome increasingly enamored with 60%, 50%, and even 40% mechanical keyboard kits, which I suspect would be easier to make robust (such as silicone-waterproofing the contacts, as per Animats suggestion above) than retrofitting an assembled full sized (104 key) keyboard.