I know what I _want_ to do with them and that's make
Voigt Pipes. I have a couple plans for these and once again
would like to use something like the wooden plaques you
mention to mount the driver in the manner of Terry Cain
(but on a budget). And it look slike the only way I'll
be able to do fancy cutting is get/borrow a Skil saw
and make a sawboard.

I have mounted my pair as open baffle and they are not
really appropriate for horns. No one has posted any
specs on them and I haven't got the setup for that.

Best interim solution for the Rolands is as the
seller suggests as an ungrade for older enclosures
to make a pair of inexpensive nearfield monitors.
So on my next dumpster dive, I may find something to
modify or rebuild. :-)

Did you get any Rolands? There was talk about sharing
info on these at the Full Range Driver Forum as well.