Why? It's usually considered to be a waste of money re-housing semi-modulars in eurorack cases >
I've patched my Moog semi-modulars a lot more, using different applications and mostly better when they're inside my eurorack case. Yes you need to rack 'em, need the space and power... but it makes it a lot easier to integrate them in your setup. When you're ready to go fully modular, you can always put them back in the original case.