this is the video I watched, it shows the max-sized turbine which is 16x9x9 outside dimensions
I built two of them in Infinity modpack with 37 Enderium Blocks each and they put out 24,000 RF/t each, so almost 50K RF/t when running. I powered them with a little 3 wide by 9 by 7 tall BigReactor (outside) which is 4 columns of 5-high fuel cells and I put Gelid Cryotheum in between the fuel rods. This little BigReactor (lol) sits right in between the two Turbine units, and that allows me to "butt together" the Reactor Coolant Port with the Turbine Fluid Port, no piping necessary. Just use an ExtraUtilities liquid transfer node with World Interaction Upgrades and Stack Upgrades over a 3x3 still pool of water and connect that up to your reactor. Plenty of water.
Oh, the 3x9x7 reactor actually put out too much power, so to conserve a little Yellorium I moderated the control rods to something like 15-20-20-15... basically, just keep lowering the control rods until your reactor isn't giving each turbine the max 2000 mb/t of steam, and once you find that point, back your control rods off one notch each - then you're making just enough power and using the min amount of fuel.
50K RF/t was too much for anything so I basically made an infinite amount of EnderIO Vibrant Capacitor blocks to store energy and I only ran my Turbines once in a blue moon, when my Capacitor bank was depleted. You can also use Draconic Evolution as a power storage, and that looks cooler too (but I never built one yet).
Oh one more thing, you can use 32 Ludicrum Blocks instead of 37 Enderium Blocks and my server-mates were getting slightly more power, 28k RF/t per max-sized turbine. But since Ludicrum blocks takes 2 Enderium Blocks each to make, it really depends if you have the resources or not. For me, 37 Enderium Blocks were fine. That's a lot of hunting Endermen at night in Ominous Woods biome. LOL