Looking at the form of it versus images of rickshaws I think it matches up almost perfectly. It's built the same way most of the ones I have looked at now seem to be. the two eye shaped suspension setups, sitting atop a square shelled axle, with those mounting clamps and rod rests sitting at the top. It lines up with so many images...the wheels on this thing definitely don't. They just seem so tiny for it, and comprise about half it's weight. So yeah probably wheel replaced on it from something else. who knows maybe the wheels are off a motor cycle...this makes me want to find the right wheels for it.
Also I just discovered it folds up (well it would if not froze up, lol)...There are wing nuts (one snapped off) that hold a sleeve down over a piece connected to the wheels...this thing at one time could have it's wheels fold up under it.