Blackbird fab "90%" cage, what sayeth you?
 

Tell me this is a good design so I can put it in my turbo car.
https://www.miataturbo.net/attachmen...ine=1344263569
Green Glory Hole will never be a racecar, will always been driven on the street 10-20x per year, and always be driven to and from the track.

It appears to be well designed with good bracing but it looks like you would want to kill yourself trying to get in and out of it for street use considering the f'ing huge panel on the driver side. Only having one angle of the cage doesnt really allow you to see exactly how it fits. Can you provide other pictures?

I'd put the forward-most bars on a plate in the kick-panel, contour the front roll hoot to the shape of the windshield, and weld plates from the front bar to the windshield frame.

This could be a good option for the green car because I fear for my life in it.

That looks to be a pretty good design with little compromise. I would do it.

I have no AC, no heater, metal seats, and numbers on the car. Driving my turbo car on the street is an event, a fun event, but I don't have plans to ever pretend it's a daily driver. It's a track-day toy. I built it to crush Vettes, and after a few things fall in place allowing me to buy a house next year, my white Miata becomes a PTE racecar, relegating the turbo car to special events and S&M style trackdays where the green car provides healing to the sick, through discipline.

Know anyone you trust? I know one guy in Dallas, but it's hard to get him to do your own design.

For a 4'9" little man that cage looks like it will be good but otherwise i have the feeling your head might be bumping the bar with the helmet on.

It kinda looks like its soft top friendly but maybe my eyes deceive me.

So long as it's pink like that.

Eh, I'd put those T-top bars on the outside like a standard cage. It's the high door bars that make cages difficult to get in to anyways.

The broom stick test is used between a roll bar main hoop and windshield as a worst case, straight line scenario. Imagine your helmeted head in the car and do a mental broom stick test between the T-top bar pictured and the door bar.

It's not about getting in and out, it's about breaking my head open if someone hits me in traffic.

I think they sell helmets like that in the therapy section of walmart.
https://www.miataturbo.net/attachmen...ine=1344267754

A guy down here named Richard Tomlin at Apex can build anything you want and doesn't charge an obscene amount to do it. I will send you over his contact info. He has welded our spec cages together and they can out great.

Plan on your head only going left in every foreseeable accident? Seems like its 6 of one vs. half a dozen of another because your head is going rattle around like a penny in a coke can in an accident. I am with Curly on this one, just get the standard halo done to limit the level of intrusion if the top comes off.

Those door bars combined with seats that have deep bolsters would be like some sort of Chinese gymnastics punishment.

Wtih a halo I limit vision and can't get out of the car in a fire if the door is "locked".

I dont like the t-top bars. Rather see a standard halo setup instead. Use the real quality sfi rated roll bar padding, yes its hard as a motha but its like heavens pillows when you hit your head hard on it. Hardest I've hit it is spinning around quick while standing in the seat with my head contorted around in the head rest area trying to plug the fuel injectors back in. But it hurt a heck of a lot less than hitting the bars at about the same speed un-padded.

If hitting your head really worries you, run a full containment seat. They have removable head container flap thingies for most brands of sheet metal seats.

No and no.

No matter what kind of top bars you have you'd be nuts to drive it without a helmet on. All I have is a roll bar and I can still hit my head against it if I try hard enough.

Also, the reason for standard halo bars isn't just for intrusion protection, its also for structure. The top corners of the front hoop are completely unsupported in that design.

Have you ever tried to climb out of a Miata with a halo seat and the 1/4 window? I would die trapped in the car.

No but had a buddy sleep inside his Pontiac Firebird when he first bought it because he didnt about the child safety door locks.

Ohh, I think there was some mis-understanding there. He was talking about halo BARS (the part of a cage connecting the corners of the main hoop and forward hoop), you where talking about a halo seat (ala NASCAR). I agree that a Halo seat would be a bitch to get out of if the door was stuck shut. Well placed halo bars, on the other hand, shouldn't make it any harder to egress through the window.

Here you can see the halo bars, and how they help reinforce the structure of the cage. They would be easy to add if go with the blackbird cage and decide later that you want full protection.
https://www.miataturbo.net/attachmen...ine=1344286995