From what I can see, it looks like you have a SATA connector, though the power for it may need a special breakout, and an mSATA connector, both in the second photo

Mines running postfix, spamassassin and dovecot and runs pretty happily in 1GB, but when I was running in 512MB Spamassassin would get killed fairly regularly when it ran out of RAM

Scientists/inventors for me - bonus points if I can find one related to the machine’s purpose (Kodi machine named after a contributor to the TV for example)