Ed - I hope this makes sense, but if not, I'll go grab the camera and photo mine to explain it better.
The answer is yes and no, Ed.
The ICS adaptor and the Madbull rail will fit on the WE, but, it will be such an incredibly lose fit the handguard will wobble all the time. Much simpler to get the WE adaptor for the Madbull rail.
The alternative to the Madbull rail + adaptor is the WE rail kit and replacement gas-block kit (as I did), but I wouldn't. While the fit and set up is more realistic (the sling-loop bolt goes through the gas block and hand guard holds it in place), the quality on mine was way off, and I had to get the hole for the gas block re-drilled so I could fit the rail in place. Not the only person to have this problem with the WE rail and gas block either.
I've just bought a WE SUSAT (or ESAT as they call it). Aside from the hideous "Phantom" WE trades printed on it, it's quite nice.