I dismantled the custom interior pieces from the chassis. It involved almost 2 months of custom fabrication to install the new interior, and it took a mere 20 minutes to uninstall everything. A few more pieces need to be installed on the dash, …but the upholstery stage is not that far away.
I made a few more cuts, and now it can fit inside the Fiero. I’ll need to do some trimming but the overall fitment isn’t too bad.