Car does look great! Cage looks superb. One thing that I noticed on the old race car is that there was no exhaust coming out the side. And on your car I see a set of mufflers under the car. One thing you may consider is cutting out the floor on the passenger side and making room to tuck two pipes up in there. Will give you the ability to get the ride height nice and low. I expect you will be doing some kind of subframe connectors and one those are in it is a lot harder to cut up the floor. Just a thought.
Doug