Update:
I bought a keyless entry unit off of eBay. I was able to install the
driver's door lock today.  I got a late start waiting for the temp to go
above freezing. The major problem was small spaces. Small access holes
in door. Tight fit getting the wires through the rubber wire grommets on
the door and pillar. Very little space behind the kick panel for the
unit. But it did work, except for the flashing parking lights when
activated. I ran out of time before I could figure it out. The
instructions were pretty vague and were just general wiring connections
for a nondescript vehicle.
Having looked at the accessibility inside the door, I doubt whether I
could put in aftermarket power windows.
In case anyone is interested, the motors were Autolöc, and the receiver
unit and remotes were Micro. Total $46. inc. shipping.
http://tinyurl.com/8lgth