They are big bastards to be sure! I gigged with my L5 copy once, it was actually OK.
If you're looking at semi-acoustics, I'd like to suggest the Epiphone Casino, either the full size or coupé version (I have one of the latter and have owned the former in the past). They're crazy light and, once you've swapped out the pickups (I thoroughly recommend Artec P90s), sound great.