I think the confusing thing that appears in many of the post is the difference between a PE and an SE designation. While I am a PE in many states (including IL) I am not an SE in any. My original test was taken in PA in 1984. While I took the “structural” questions my PE is in Civil engineering and I received a PE via comity in all other states including IL. As Illinois law is currently written (at least to my understanding) I cannot even sit for the SE exam as my experience was never under the supervision of an SE.