Overall the cage looks good, though I'm hardly a cage expert. Still, I have a couple of questions...
First, why wa the main hoop mounted so far forward? The harness bar looks to be bent and runs 4" or so *behind* the main hoop. It would have been better to move the hoop backwards 4" and attach it to the rear seat bulkhead, which is a major structural component of the car -- ideal for mounting the main hoop to. That would have moved the harness bar into the same plane as the hoop and made the entire section much stronger, and would have been easier to fabricate, too. As it is, there are compromises made to accomodate that offset harness bar that add weight.
Second, there are a pair of stringers running from the center of the harness bar to the rear of the car (to the shock towers, I presume.) These are not necessary and add extra weight.
I've got mixed feelings about the Petty bar running down to the passenger footwell. I'm not convinced that it does much to make the driver any safer, and it's been show in FEA that it does very little to stiffen the chassis. It does add a lot of weight, and makes it impossible to carry a student (important for instructors like me.)
I'm also seeing some "floating nodes" -- places where a bar ties into another bar and there is no other supporting bar to support the first. DSC00130 and DSC00104 are good examples of this. That door bar could have been raised up to where the harness bar attaches to the hoop to better support both tubes in a collision.
There is no A-pillar bar. This is a vertical tube that runs from the NASCAR door bars up to the top of the A-pillar tubing, where it meets the halo bar. This better supports the halo bar and A-pillar in a rollover.
If you're at all curious about cage design, here is an excellent discussion about a lot of stuff that's cropped up over the years:
Keep in mind that just because the cage meets the class rules, that does not mean it's a good design -- it's just good enough. This is why I stress going to an experianced fabricator. They know all the tricks to building a good cage for minimum weight.
(And no, my cage isn't perfect, either. It meets the rules, but there are places where I can make it stronger or easier to live with.)