The latest project is a ZX81. This is a revision 3 board from 1981. I've built the mechanical keyboard for it and have an internal 16k ram expansion (to solve the wobbly ram pack crashing issues) and the UHF module has been stripped ready for the HDMI conversion kit. The keyboard, obviously, won't fit in the case so that is a future challenge. So far all signs are that it's functioning, but the Ferranti IO chips are known for dying so once I've got the video output I shall see what it gives me.