"The upper one will be difficult to reproduce without a mold. It seals the flat splash foot panels to the upper dash."
Having just looked closely at my panels, I totally do not understand this. Looking in at the passenger side and up along the body where it is glassed together, the panel is just flat - there is no molding needed. Unless you are referencing something else.
Here are the photos of the front wheel well panels:
Looking in towards the nose from just inside the wheel well. That darker curved line along the top edge is where it gets glassed in.
This shot is looking slightly forward to show the curve of the panel against the body. IIRC, I simply bolted the bottom of the panel to the frame of the bumper mount to hold it in place and then roughed up the body and panel with 60-grit sandpaper and applied 4 layers of fiberglass mat and resin. Done.
This photo below is looking from the right front quarter back at the rear of the new panel and how it is shaped to get around the front beam and sway bar. It is glassed in against the outside surface of the frunk at the top (see first photo) and bolted to the bumper mount. That's it, and no curves at all. You could make one from a flat sheet 22" X 22" square, which means you could make both from a sheet of this counter top material:
https://www.homedepot.com/p/Wi..._-206753327-_-N&
Hope this helps! As I said earlier.... Make a paper template to fit the space, use it to cut out the panels from a fiberglass sheet and glass them in.
