Nice detail. I always wonder why oh why on a raglan design the designer puts shoulder seams. I'm not interested in starting one right now, but I've made several bottom up raglans and could help you. Basically, knit the front and back in a tube up to the underarm, which would be the row before you start the patterning. Then knit the sleeves to the same point. You may want to bind off about 9-12 stitches on each sleeve and on the sides of the body for underam. Then join all the stitches one needle. Call me when you get to that point and we can figure out the decreases.