Replacing front subframe/inner fenders

[chevy454]

Have a Vega that has a bad front clip (subframe/rails, inner fenders, etc). No one makes a Vega specific front clip any more, so I'm wondering if anyone has any experience replacing the front subframe assembly with one from a donor car? From looking at my car it looks like the subframe is butted up against the rockers maybe? Anyone have any of these parts left over from race car build? Or does anyone know of someone that has a Vega specific front clip rat holed away somewhere?

I've attached a picture that I found on the forum here, which user "megavega" gives photo credit to "demon precision".