Excellent use of the sewer tunnel! adding the water was a really nice touch! and also I like how you added the lighting I need to try something like this you inspired me to give it a shot! I am getting ready to try a fake water Dio but im going to to use Clear silicone calking im not sure how it will turn out but if it looks good it could be a cheaper alternative for you over the Hobby water stuff. Ill be posting pics soon.