We (our local makerspace) got a Sharp PC-7000 gifted. The machines seems to work, both drives, display, speaker and keyboard.
I'm wondering if there is any space for internal upgrades in it? Like an XT-IDE card?
I couldn't find any pictures or videos online that would settle this question one way or the other.

As the external drive add-on was supposed to sit below the machine, I'm thinking that there might not be space inside, but it would be nice to know without opening the machine.