HP 7475A

I am new to this group, and have interest in making a CNC for use in
architectural model making and possibly wood work (canoes, curved
things)

I have access to about 9 Hewlett Packard 7475A pen plotters (11X17"
capacity, 6 or so pens). Are these units useful for making a small
machinge, perhaps using a dremel or similar for cutter?, or are the
motors too light duty for the job?

Also, any idea what a fair price is for them if working? (they are
pre-1990, and use an off-base serial connector)

I'll watch this thread, and can be directly emailed at hdesign@...