I made a 64K internal memory expander (with 2x32K SRAM). Manufacturer's files are based on the original description.
Thank you for uploading the Gerber files for your design, I *really* appreciated seeing those!
The best thing (for me) was that I could actually measure where the holes for the standoffs are on the board, in relation to the EXP1 connector ... I was really wanting that information!