Yes and no. Like you note, this current build is really limited. I'm presuming you'll be relying solely on the 2S's filter which is...OK, up to a point, but you could try and add something small here. The overall problem you'll be facing in a 3U Rackbrute is space, so going with large widths on your modules is a bad idea. Consider smaller alternatives or, perhaps more sensibly, go with the 6U version which would then open up another 88 hp for additional modules with which you can work in the Rackbrute or use them to alter the 2S's functions. But even then, I still suggest you keep the module sizes small...you want as much functionality as you can get in that tight a cab.