yes it is possible. what I did in my 92 DX was i got a SPAL power window kit and got from EX door panels and switches. And just wired it up. Total costed me around 200, 100 for the kit and 100 for the panels/switches

it should look something like this, that isnt my car but a pic i found on the net.

http://www.geocities.com/civic_fi/92civic/pw/win.jpg