hey, and welcome. you would need to steal everything from the other jeep, there's a soft top frame, that folds up and down, that the cloth top is attached to. you can do it, but you have to take it all. i think there's even rails that have to bolt to your tub, not sure on that one, been a while.
don't ditch the hard top, they're nice. i never used to care, but now that i'm not 20, and don't ride in the snow w/ the top down, i like the hardtop to.