Anybody ever tried to build a dock?

I live on a small lake in NE Mississippi. Not any wake or current issues. But it is a very soft muddy lake bed. I am still about a year away from buying a boat with other projects around this house. However, a buddy of mine is buying a new boat and I can pick his up for a sweetheart of a deal! That means, to make this work, I have to figure out immediately how to get a covered dock! I have tried a few contractors in the area and they are months away, and most didn't even return the call. I saw a deal called Tommy docks and it looked interesting. Just wondered if any of you had tried this project on your own.