How comfy are original buckets?

I've never done upholstery work, but here is a question. When you put a new set of covers on some oem buckets, couldn't you add a little more support i.e. different/firmer padding, maybe a lumbar set up from a newer vehicle? I'm going to be covering mine with the help of a friend that does upholstery, and I want to try to make them more comfortable.