This is a replica PCB made with KiCAD.

This board is not a 100% accurate replica, because the added directly on the PCB a few updates published later by Elektor :

• a fix for memory decoding needed for the expansion board
• the main decoupling capacitor C2 was on wrong side of S25 (activate display) which could reset the computer
• a simple reset circuit with a resistor and a capacitor
• Also replaced the 2708 EPROM by a 2716, which avoid the need of a hard to find EPROM & EPROM programmer, and has the big benefit of reducing the required power supplies from 3 (+5,-5,+12) to only +5V.

More details, also yet untested Interface card and other cards at his github page.