I don't draw greens plans at all.
In the beginning, when I was going to build them all myself anyway, there was no point.
Since then, I've been working with shapers who work for me, and I find it easier to describe the general parameters and let them do their thing, instead of doing a drawing and then (as Adrian suggests) changing it 95% of the time once we get in the field.
The most important thing on the plan is getting the finished level of the green at the right height. When contractors build greens from plans I find this often comes out wrong, and then they have to spend extra money cutting back out some of what they just filled up (or vice versa). I am much more comfortable starting in the field with my associates to make sure that elevation is exactly right, giving them a sense of the strategy (bunkers right, tilt to left, crowned, tiered, whatever), and when we do it that way I find that the edits I make are pretty small.