I know the topic comes up here from time to time, so I thought the list
might
be interested.

I have been playing with a Qbus to IDE drive adapter for a while, and
with some
free time this Christmas, I got around to working on it and documenting
it.

You can find information here: http://www.chd.dyndns.org/qbus_ide/

In summary, I have designed and built a Q22-Bus to ATA disk adapter and
written drivers for 2.11BSD on my microPDP-11/73. The adapter is PIO
only 
(for now) and the driver only works with LBA capable disks. It does what
I need for now. If anyone is interested in collaborating on extending it
for use with NetBSD, I am more than willing to cooperate. I don't think
my programming skills are up to writing a driver for NetBSD and I have
a diskless MVII that I would like to get running.

-chuck