I saw something on youtube the other day that really made sense. When I cut wire recently, I used a small pair of tin snips, other than leaving sharp edges, it will wear your hands out cutting the baby saver small wire. Anyway, this guy was building cages and used an angle grinder, which just ripped through the wire and he said it kept it from having sharp edges because you could sand them right off after. It certainly took a lot less time than using wire cutters!
I prefer top opening cages too, I have 2 side opening and the doors are small, so kind of have to wedge the rabbits out of them even though they are good sized cages, whereas my top open (which is actually an exercise pen for puppies I got off CL with 1"x 1/2" wire across the bottom that I put on with J Clips) is a lot easier to remove rabbits from directly from the top. The only problem is that the ex pen is tall and I'm short, so if they get toward the back it's harder for me the grab them, I zip tied the side door closed because it doesn't secure that well and there's no way I can reach all the way back from it. My next build will certainly be shorter in height, this was one of those "Wait I already have this and could make it work" ideas.