Simply put 110 based welders are good for small things but for cage work they just aren't worth the hassle...here is your biggest deciding factor though:

# Duty cycle: 20% @ 75 amps, 45% @ 50 amps

Not an impressive duty cycle in the least. If you just want to do some light metal welding then it would be a nice little machine to have around the shop, but for a cage I would want better duty cycling as well as heat range with a power feed and 220 power for penetration power.