The first big issue is that the Road Hog isn't out until June. The second is that honestly, I wouldn't be using Rorsh and Brine until at least 35 points. They're brilliant, don't get me wrong, but they're a little hard to use and at lower points I find you won't get as much out of them. By contrast, Carver adores Brigands, and a max unit is exceptional with them. Quagmire on a max unit gives you 10 models able to lock down crucial enemy models and lets you spread out that -2 Defence a bit more.
So, for the list, I'd drop Rorsh and Brine, max the Brigands, and take a Gun Boar. This leaves you with 1 point to spare. If you don't want to wait until June for the Road Hog, grab a second War Hog and Targ and you've got 25 points exactly. I recommend multiple War Hogs anyway, because War Hogs are awesome and because when/if you get Arkadius, you'll find you want about three anyway. In fact, Carver, two War Hogs, Gun Boar, max Brigands, and Targ is what I used quite frequently for my 25 point matches when I was starting pigs. It's an extremely brutal list, capable of pulverising most opposition pretty easily. It also expands fairly easily to 35 points, where you can just add Rorsh and Brine for 34 points total (and when the Road Hog does come out, you can swap a War Hog for a Road Hog and you have 35 points exactly).
As an aside, you may find that extra infantry perform more effectively with Carver at 35 points than Rorsh and Brine. I've used the pair in 35 points a good bit, and they're damned effective. Sometimes though, sheer quantity of models have a quality all of their own, especially with Carver. The more models you have, the more models are affects by the Feat. Slaughterhousers, for example, can get to a staggering P+S 11+5d6 for damage rolls on Feat turn. Can give you the pleasure of watching one unit of six shred two Khador 'jacks in a single activation, if all goes well
Edit: About the Tier vs Pact thing tort mentions above, I wouldn't bother with the Tier list until you have multiple units of Brigands. Otherwise, I'd pay the extra point to give all your units Advance Deploy (very useful with Farrow infantry in general, and Brigands and the Razorback Crew in particular, as it lets them get a good deal further up the field and Dug In). The big reason for that is mostly that Farrow don't actually have a 1 point option, so there's nothing you can really do with it aside from swapping, say, a 2 point option for a 3 point option.