I've seen a few people cut the hatches in half to do it, but it's not really worth the trouble imo. I'm too lazy to dig up the thread, but a guy from Australia or NZ did it and posted pics over on CF earlier this year.
When I cut the rear of my XJ off I'm putting in an MJ tailgate in the back. Figured I'd get a camper shell too and cut it down to length as a removable hard top. Obviously a lot more work, but end results kinda the same.
These new sig limits suck. Thanks a lot Canada.