ive seen it one a few crx's, one might have been a hatch, its been a while. I dont think anyone makes a kit if thats what your looking for. best bet would to find a hot rod place that does that sort of stuff.
IMO it doesnt look very good due to the shape of the door. If the doors were square like on older cars it would look pretty good.
Suicide doors have been around for ages and ages... your best bet (since no one makes a bolt-on kit for it), is to go to a "minitruck" shop, and commission them to do it. It is done all the time on those trucks.
I actually do think it might look kinda cool on a CRX. Never seen one done cleanly in person though.
Oh, and choose the shop WISELY! Be sure to see previous work, and make sure you are looking at pictures BEFORE they give it to the painter... painters have a nice way of hiding shoddy fabrication... lol.