I'd like to contribute something to the wiki.
First, I have made 600dpi-scans of a cartridge-pcb.
Download them from my project called "The Strip Club", where I disassemble and grind all kind of videogame-related PCBs:
http://circuit-board.de/forum/index.php/Thread/13913-STRIP-CLUB-PCB-Scans (http://circuit-board.de/forum/index.php/Thread/13913-STRIP-CLUB-PCB-Scans)
Next will be a printing-template for cartridge-labels including a cutting-path for round corners etc.
(https://lh3.googleusercontent.com/-9_EF75v-tFo/VFOXz-msd0I/AAAAAAAAJ4c/6gL12Ryru_g/s800/AMSTRAD_CPC_CARTRIDGE_PT_NO_Z90903_B_PARTSSIDE_WITHOUT_PARTS_PCB_SCAN_ATV.jpg)
Just saw this. Thanks for the scans mate, I'll add them to the relevant article!!!
...and added: GX4000 cartridge - CPCWiki (http://cpcwiki.eu/index.php/GX4000_cartridge#Pictures)