RyanB I agree with Dave use the natural structure. To make improvements to them a little info would help. Size and depth of the lake and the avg max ice depth. Also the types of fish you want to fish for. Here is a link to the Forum archive on structure how to and pics.

http://www.pondboss.com/forums/ubbthreads.php?ubb=showflat&Number=92463#Post92463

Glad you posted and please join in .