I believe there's a fix for the PCMCIA problem when using an expansion. I'll see if I can track down what needs to be done.
You will only need to do a little redesign of the memboard of your choice by adding an own memmory controller.....
Seriously, the plain 8 MB FastRAM boards use the Amiga autoconfig to add the memory to the system. Autoconfig will place the RAM into the 8 MB ZorroII window. That is the reason why those boards are limited to 8 MB.
What you remember is the fix for the PCMCIA reset bug. Without that fix you will have to reinsert a PCMCIA networkcard after every reset to be recognized. There is a hardware and a software patch for this.
