You guys are amazing... plates were the primary reverbs in NY... "Chambers" were more prevalent in LA... so let's say you're looking more toward that LA kinda sound ['cause it's a whole lot easier to do a chamber with a C-note than it is to do a plate]... take a speaker, put it in your bathroom, take a mic, put it in your bathroom too. Play the music/tracks on which you want reverb through the speaker, return the microphone to your mix.
Want stereo? Use two microphones.
Want the reverb to sound shorter? Add towels, close the shower curtain... want it a bit longer? Remove the towels, remove the shower curtain and compress the return.
This is pretty much how it was done before the "verb in the box" ... people actually used physical environments for all kinds of groovy shit.
Peace.