Art is right - there are many cab types, from simple weather tents to hard steel & glass rooms with roll-over protection and good outward visibility. The factory cab is at the top of the list for the Lxx10.
Adding a cab to a tractor that wasn't originally built with one takes some doing. To keep the loader removable the valve moves to the cab. The ROPS is integrated on some cabs, including different frame pieces above the rear axle. The tubing and valves for heat and ac compressor, condenser etc need to be added.
Trading sideways can keep it simpler. Major attachments like loaders and cabs depreciate quicker than the rest of the tractor - sometimes a used machine with a cab is not much more than one without. At today's low interest rates, owning both machines for a while wouldn't cost much. You could end up with a top-tier cab for a low net cost - with minimal work required.