If you want to make your sweater in one piece this is only going to work if you can start on the sleeves before you start your raglan shaping. That's the way I do it. I haven't made a sweater that I have to piece together in a long time. Just hate that seaming
Here's the Elizabeth Zimmerman method:
(You have cast on 160 stitches as the Body stitches so everything else will be a percentage of that number.)
Put 8% of body stitches on a holder or waste yarn at each underarm and set aside. That would give you about 13 stitches for the underarm
You'll cast on 20% of the 160, which is 32 for the sleeve. Join and work in the round, increasing 2 stitches every 5 rounds. When you have 33% of 160 (about 53 stitches) on your needle, work straight until the sleeve is as long as you want it to the underarm. Put 13 stitches for the underarm on a holder or waste yarn.
Make your second sleeve.
When it's time to work the body you will put all of the body stitches and all of the sleeve stitches on your needle, matching the underarm stitches that are on your holders. Work all these stitches around for about an inch.
Now mark the stitches where the sleeve and body join -- you can put a marker in between the first and last stitch of the sleeves in the front and back (you can use a loop of yarn or a twist tie or even a small rubber band if you don't have a marker.)
For the raglan decrease you work up to 3 stitches from each marker and then k2tog, k1, slip marker, k1, ssk. Work the decrease every other row until you have 5% of the sleeve stitches left on the needle.(8 stitches)
This is probably way more than you could do in an hour on the train but I thought I'd give it to you just for giggles!
Hope this helps some!