I don't think it's possible to cut a Fiero down far enough to get it anywhere near the Atom in any way, shape, or performance metric. It just isn't going to happen.
The only thing that I can see them having in common is the mid engine configuration. As much as I like Fieros I can't think of one Fiero part I would use on an Ariel.
IMO its like comparing apples and oranges. The Fiero is an all purpose "car", the Ariel is a purpose built track cart that they did just enough to make street legal. That being said I would imagine the Atom is a blast to drive on a track.
Obviously from the responses I've gotten I have gone at this in the wrong way. All I want to do is build an exoskeleton type of vehicle. I'm not at all familiar with the space frame of the Fiero. I am trying to educate myself on its structure . I just want to build a stripped-down, exoskeleton, topless, doorless, fun Fiero. I have an 87 notchback for this project.
Obviously from the responses I've gotten I have gone at this in the wrong way. All I want to do is build an exoskeleton type of vehicle. I'm not at all familiar with the space frame of the Fiero. I am trying to educate myself on its structure . I just want to build a stripped-down, exoskeleton, topless, doorless, fun Fiero. I have an 87 notchback for this project.
The Fiero is a stamped steel frame, not a tube chassis. It's not very pretty without the body on it:
I would go about it like this if at all possible. There is this thing called the Eliminator V2 that is a kit car built off the Miata in Opelika Alabama. They make a track legal 250+HP spaceframe that may be about what you're looking for. In terms of Fieros I think the closest thing would be this Ford SHO powered stripped down Fiero buggy. Looks like it has some sort of rollcage in it and all sorts of aftermarket and chop shop fixes to it, but underneath it's a stripped down notchback.