The Ercoupe 415C is a great little Sport Pilot trainer, though it's important to emphasize that it is
not, and never will be, truly an LSA -- it's a
certified airplane that Sport Pilots can fly. This is an important distinction primarily from a maintenance perspective (the annual inspection, for example, will have to be done by an IA).
I have a primary student finishing up in one right now (in fact, we're flying today). Here are the weight specs of the one I use:
Max gross = 1260# (there's an STC available for some models to take the max gross up to the 1320 pound LSA limit, but that requires modifying the tail in some cases. There's also a 1400# STC -- if that's
ever been complied with, the plane can
never be Sport Pilot eligible.
)
Empty wt = 820# (this one is heavy, because it has metallized wings)
Useful load = 440#
Max fuel = 138#
Payload = 302#
I usually fly it with 5 gals in each of the mains, and 5 in the header tank. This leaves 350# for student and instructor, and still allows enough fuel for a 2-hour lesson with VFR reserves. Cockpit is tight (about like a Cessna 150), but adequate. Heavy students (or heavy instructors) probably won't work too well.
Check with the Ercoupe Owner's Club online for more information about this wonderful little plane. If you get to the point of seriously considering one, you should join the club, and get checked out by one of their authorized instructors. (Shameless plug -- I am one of those!)