If you are able to read german text, then the
documentation of a 32KW
dynamic memory modul
from mico for the pdp8/e/f/m and /a may give some hints.
I've made a scan available under
http://pdp8.de/download/mico-mem.pdf
Thanks -- unfortunately that mostly documents the parts I already understood
:-).
The timing diagram is somewhat helpful, though.
Vince