Here's what I would do, based on the limited info on their website. Seems to be a pretty simply, low ABV beer:
GRAIN - Gives you 1.040OG (site says 1.038 - probably to compensate for the berries added later)
5.5lb Light Liquid Malt Extract
.5lb of Crystal 10L - Steep for 30 Mins around 150F before boil
HOPS (Low AA% yields a 10IBU for this beer - probably good for the low gravity and to allow berries to shine through)
.5oz of Hallarteau (4.8%AA) for 60 Min
OTHER
5lb Fresh Berries - Pureed - Add to secondary for 5-7 days
YEAST
Any neutral, good attenuation yeast. Nottingham or Safale S-05 would work great.
Good luck and let me know how this brews up if you decide to take my advice.
EDIT: Keep in mind this is for a full boil of 6g, resulting in ~5g of beer. If you can't full boil, you'll need to up the hops for utilization. For a 2.5g, partial boil, with the LME added at beginning, you'd need to use closer to .85oz of hops. Or you could probably stick with the .5oz if you did a late LME addition. I don't know much about late LME addition though. I've always added LME at the front end when I brewed extract. And now I AG...
EDIT2: I'm also just guessing at the fruit amount. It says they use 55lb of raspberries per batch, but I have no clue how big their batches are. If they are brewing on a 3-barrel system, then it would be less than 5lb for 5g and vice versa. You could always add 3-4lb. and let sit for 5 days, taste, and add another 1-2lb if its not to your liking...