That is Steel with Glass.  The Glass offered would be laminated.
You need to verify it Tempered + Tempered or Sometime they offer Tempered+Float Glass( Lower cost)
Also must get Warranty. Usually They Warrant 6 months.
Spontaneous breaking happen to Glass

You can use our Lexan* Sheet instead of Glass.
10 years Warranty Against Yellowing, Breaking( except from Screw Holes) & Loss of Light Transmission

Cost wise, we guess contractors would be the right person to advise.

With Lexan* 6 mm Exell D Solid Polycarbonate , the Weight is 25% of the Laminated Glass, therefore in theory, the cost may be par due to the structural ( steel) cost.
Available in Clear or Tinted Green(similar to glass tinted green)

Yes, it Called Twin Wall ( 2-Walls)
We have been selling this in Malaysia for more than 30 years.
It's Low Cost and Good Insulation.

And for more than 3 Decade, We builded Stadium with Multi Walls. ( 2, 3, 5, 7 & 9 Walls)

We work Close with a Company in Netherlands who made a Tape , which Covers the holes.
It allow Condensation water to flows out and prevent Dust from entering.
Dust and Water will allow the Fungus to Growth.
We even included this in the Technical Manual , which we share our Technical Experience.

Petaling Street is using this Tapes and many other major projects too.