Are there any former TI employees from back in the day reading this message? If so, do you have any knowledge about the TI-99/4A's design phase?
Was the reason for the extra space over the RF shielding just a byproduct of design concerns like keyboard placement, horizontal cartridge insertion, or heat dissipation? Or was it to accommodate for a 'stylish design'?
That space sure comes in handy for hardware hacks, but for some reason I cannot imagine TI would even entertain the thought of aiding hardware hackers.