Late to the party but I love this setup! The SmallRig 3934 Full Cage for FUJIFILM X-H2S is a total steal and leaves plenty of room for cooling vents. For the screen, you gotta go with the Atomos Shinobi 5-inch 4K HDMI Monitor. Its super light and wont break the bank! Youll easily stay under that 600 budget and have money left for extra batteries. Its a killer combo!

Just catching up on this thread while waiting for some files to transfer. I went through this exact struggle when I upgraded recently. I thought my old kit would work, but everything was just slightly off. In my experience, the biggest thing I learned was about balance. I once rigged up a monitor on top and the whole thing kept tipping forward because the cage didnt have enough mounting points at the back to offset the weight. It was a nightmare on a long handheld shoot in the heat. Ive tried many rigs and honestly, the heat sink effect is real. One setup I had actually trapped heat because it was way too snug around the camera body. These days, I look for something that gives the ports and vents plenty of breathing room. I eventually settled on a setup that lets me swap batteries without taking the rig apart... huge relief compared to my first attempt.