Need an up-to-date, accurate, complete install doc

So, after discovering late in the game, from the FAQ nowhere mentioned in
the install doc, that I can only use OpenBSD on 68k Macs with a single
drive, and that the installer has problems with 'large' partitions...

I'm trying to install 3.4 on a Quadra 800. After learning that one large
partition just wasn't in the cards, I went for multiple partitions,
and am having difficulty: I want to have /usr, /var, and /home on sep.
partitions. The drive is large enough - 2 Gigs.

I can install onto a 256M / partition everything non-X , but can't figure
out how to mount the other partitions appropriately, nor how to copy /usr,
/var, and /home from the / partition to the partitions I've created
specifically to hold usr, var, and home, as appropriate. The install doc is
a little vague in spots - to say the least - and I've tried the business
about:

"	You will need to know the proper device to mount the remaining
	partition(s) by hand:

		* Select "Build Devices" from the "File" menu. This builds
		 the necessary tree of device files on your filesystem in
		  /dev.

		* Select "Mini Shell" from the "File" menu.

		* Mount the filesystems you wish with the command:
			mount device path
".

That didn't work.

I've tried installing just base, bsd, and etc on the installer-identified /
partition. I can boot to that, but the system comes up read-only. I haven't
been able to find documentation - near the surface of things anyway - that
tells me how to change that.

I've tried the recipe at http://www.openbsd.org/faq/faq10.html#DupFS to
copy /usr to another partition so that I can continue with the
installation, but suspect the command there isn't applicable to 68k, or the
command is incorrect. And, if it is relevant, won't work unless the
filesystem is rw.

Also, the install doc is ambiguous, possibly incorrect, about when (and how
often) to Make Devices from within the installer. Do you really run it
twice, once before installing anything (is that even possible? - I seem to
recall having tried that without success), then again after installing some
combination of the base packages?

I attempted to install OpenBSD several years ago, on a different 68k
machine, and seem to recall there was some problem with the creating of
/dev/ttyxxs. If there was such a problem, has that been corrected in the
intaller and packages for 3.4?