I would grab that deal for the price... I bought the hardside cab on a pallet 4 yrs ago for $3700. It took two of us about 6 hrs to install on the L3830. Now countless hours later I have a 4 cct fuse panel fed from a 50A breaker, ft/rr work lights, rear view mirror, heater with fresh filtered air, aux 12v plug for the heated seat pad, gun boot hangar, frt wiper (was included), rear wiper (from a wrecker IH cab) that bolted into the predrilled glass holes. I was really pleased with how the loader valve fit through the front lower glass porthole in the cab, no need for any mods except popping out the glass. I can still lower the ROPS and squeeze under the 7 ft garage door. The lockable door latches still work flawlessly, the weather stripping against the fender wells all fits tight, the headliner is still glued in place. For sound protection I wear a set of AO Safety Worktunes, they even work great for FM reception. The biggest drawback to this cab IMO is the radiated heat from the console and floor. As a trade-off the heater in Winter easily makes up for it.
I planned on installing some reflector bubble wrap to block the heat from those areas, but now I have a 5740 with factory cab A/C for those hot days (could not resist the deal on this one!!) One thing I will have to be careful with is not scraping the new fiberglass roof under the spruce and pine limbs like I always have previously with the metal Curtis cab.