The Pennsylvania fish and game commission has these plans on their site. I followed their design including making the template to start the base on. They were easy to build and I will say 2 years in they do attract fish. I mounted a foam filled plastic bottle on a line to mark each piece of structure and now I just cast over the structure or drop a line down from my boat and never suffer from lack of a hit.
I had a local sawmill cut up some hemlock into 2x2 pieces so everything went as per their plans.
This is their pdf;
http://www.fishandboat.com/Resource/Documents/lake_structure2_porc2.pdfAs far as my fears of snagging my hooks on the structure, I took the circle hooks suggestion and that seems to do the trick.