My pattern for a sweater requires the maker, after joining the front and back at the shoulder seams, to create the sleeves by picking up a certain number (n) of stitches starting at the front armhole marker and ending at the back armhole marker; then knitting the sleeve from the top down.
My question : would it also work if I knit the sleeves separate from the body by casting on (n) stitches and knitting as if they were joined on.
This would allow me to have both sleeves on the go at once. Downside, I'd have to sew the finished sleeves to the body.
Can anyone let me know if they think it would be OK, and/or they have successfully done this? 
T I A