There are a couple of threads on Kabo already active in this forum and Terms and Endearment.
They have an office in Miami and a couple of American reps working there. Those guys are pretty good to deal with but be advised that the guy pulling the strings (Mr. Kabo) is a total flake. Several US-based guys flew for them last year. Most were paid (very well) eventually but it was a struggle. Add to that bases in Nigeria or Iran for the first phase of Hajj and maintenance and ops practices that are dodgy a lot of the time and you have a risky proposition.
To sum up, there are a couple of very knowledgeable guys in the Kabo operation who keep the thing going but you have to wonder how long they´ll be able to keep the plates spinning and, more importantly, if this is a proper way to operate 747s.