gastropubs in westside?
Library Ale House on Main Street in Santa Monica/ Venice. Sorry I haven't been to give any feedback but it is the kind of place you are looking for. Also, in this month's Gourmet mag they feature the beer sommlier at Rustic Canyon on Wilshire around 14th area. It is more upscale and certainly not gastropub but several very high end small production beers to check out .
Ford's Filling Station in Culver City considers itself a gastropub; arguably Beechwood in Venice and the Del in Playa (though they have actual, separate restaurant areas as part of the premises); Tompkin's Square in Westchester (though the menu might be too limited to count).