does it have to be socket7 ?
if you need MB design schematic for educational purposes, check the ALIX board schematic (it is
AMD Geode LX based motherboard, very small, comes in different versions, with / without vga, with / without usb, with / without miniPCI ... it is x86 compatible and you get a full motherboard schematic)
for example:
PC Engines alix3c3 product file and
https://www.electro-tech-online.com/custompdfs/2009/02/alix3c-1.pdf
ALIX boards are easy accessible all over the world (even in this god forsaken country)