I didn't have a section but I have a cheap home made co sleeper. It's an ikea gulliver cot, which can be assembled 3 sided. I put the mattress in at a height flush to my mattress (easy to put a couple of holes in to do this if the set points aren't suitable for you). I've tied it to my bed frame. It means she won't outgrow it before she moves out and if I wished I could have used it for her nursery cot afterwards, though I bought a cot bed for in there.
I keep her change bag next to us with a travel change mat in so don't even need to get out of bed for that. The lazy mother's guide to sleeping well, haha!
If you're concerned about the baby feeling too exposed in it, roll up a towel or blanket and put it under the sheet in a U shape and they can snuggle into that for security. Just make sure the top of the U doesn't come high up enough for the baby to put its face into it.
I love it, she's right next to me and in the night I just pull her over to me and feed her. I can lie and watch her sleep and sometimes she slides closer to me and bats me in the face with her little hand. That should be annoying but I just find it cute!