By Mike Pound, Post-Gazette Steve Ilnicki doesn’t have designs on becoming huge.  But that doesn’t mean the head brewer of Bethel Park’s Spoonwood Brewing didn’t start big when the brewpub opened in late January. It’s a big space: a 15-barrel brewhouse, a full food menu, easy seating for 250 thirsty customers – or more, now that the patio is open. And it’s off to a big start. While working as an assistant brewer at Homestead’s Rock Bottom, Mr. Ilnicki answered an ad on a jobs board at the American Brewing …