Project goal:

Replace the internal PCB with a modern version.

Specifications:

Video output, not UHF.
16 KByte RAM
microSD card with games, controlled with a menu and an extra rom
Kingston Joystick Interface.
Power button.
Standard expansion connector (May no be room)
No cassette input (Power switch)
ULA replacement

Sources:

http://www.user.dccnet.com/wrigter/index_files/ZX97lite.htm

http://www.knaapic.nl/wordpress/?page_id=374

http://www.knaapic.nl/wordpress/?page_id=434