Left side drive

Now this is pointless. Have you ever had troubles with having an unequal load on your bike? You'd also get chainline issues x 2 especially since most bottom brackets are asymmetric.

To the original poster: as you've already said, your pedals will unscrew, and you may struggle to find a bottom bracket which fits.

http://www.bikeforums.net/archive/index.php/t-366418.html suggests many bottom brackets are symmetric....