Two well-known Gainesville Theatre Alliance actors will tackle the Tony Award-winning musical “Red” by using a smaller more intimate theater to share the story of an artist’s ambition and vulnerability as he tries to create a definitive work for an extraordinary setting. Raw and provocative, “Red” focuses on master abstract expressionist Mark Rothko, who has just landed the biggest commission in the history of modern art, a series of murals for New York’s famed Four Seasons Restaurant. In the two fascinating years that follow, Rothko works feverishly with his young assistant, Ken, in his studio in the Bowery.