This company has kits for a 16' x 7' garage door. They just need to know the height of the panels (mine is 21") and they are $100, which seems to be about what everyone that's done it on these messages is spending. I was looking at $60-$80 for insulated panels, then cutting.
The kit has 'trim' for the vertical posts for the type of doors that the panels don't 'tuck' into on the left and right sides.
It looked good in the demo panels that they had at the home show. They were a full 2" thick, and light.
They are in the Texas and Oklahoma area. Not sure if they'll ship it, but there may be other distributors. I'm going over to pick one up next week. Don't know if they manufacture it or just distribute.
Their website is: www.gdsofusa.com. It doesn't have product info, but does have contact info.