As stated I am completely new at this.
For the past 10 years I have been having these made out of 26 gauge steel panels.

My thought is that I could use these steel panels as a mold and press the shape out of fiberglass.



I am completely new at this so I will start with some basic questions.

  Is it possible?

  The final panels at 40x48 and made out of a full 4x8 foot sheet. How much fiberglass would you need to make a similar panel.

Thank you in advance and I know I will have more questions.

I can see a couple of problems here.  First,  you will have to "roll" the top metal sheet onto the bottom sheet whilst feeding the glass mat in from the open end,  otherwise the glass will not be able to slide fully down into the bottom of the valleys and will tear.  Second,  it's going to be really difficult to get even clamping over the whole area unless you use a vacuum system,  the pressure required to get that length of glass into so much corner will add up to quite a lot,  enough to bow the metal,  although perhaps you could cover it with sandbags to get distributed pressure.