I decided, taking all of your good advice - to turn this sweater
Into a Tubey.
Now, I promptly ran into an issue with the construction. I don't have a clue how much yarn I really have, or whether it will be enough for full sleeves. Tubey is knit sleeves first, then the body down.
Since I really prefer having a body on the sweater (I am way to hold to have my stomach and belly button hanging out), it means that I am going to have to knit up, then do a bit of complicated fudging to knit the sleeves out from the center as part of the garment (I hate sewing things together when there is an alternative.
Deciding that I really don't want much white on the bottom/sweater body - I have started.
Since all the colours originally came from the same set of bats, separated out by colour for spinning, I am hoping that this will work.
And 5mm needles are so big!