I used Lexan to cover another battery project I did a few years ago for some headway batteries. I just used a 2x4 piece of wood and a heatgun to form it this battery, got me thinking to use it again.
Did a little AI search::
'Yes, Lexan (a brand name for polycarbonate) is considered fire-resistant. It’s not just fire-resistant, but also flame retardant and self-extinguishing when the flame source is removed. This makes it suitable for applications where fire safety is a concern."
Hi,
Regarding DIY battery Pack, It seems that the new 21700 P50B cells are very interesting in term of power density and life (5000 mAh), compared to P45B. Of course, a little bite expensive than P45B. Do you think, it’s a good option?
At this point in time - Im liking the AmpAce JP40
Check out Coolwatts testing
Unfortunately they are hard to find.
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In the meantime there is another 5000 mAh cell: EVE INR21700-50PL
With 70 A max discharge current it looks very promising, but gets a little warmer than the 4500 mAh cells:
https://www.youtube.com/watch?v=PIC_jEv6k1Y
Maybe i’ll give it a try.
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I still have to watch vid – but in my mind for “Safety” - I don’t want to draw more than 80% max of a battery during the 1st couple minutes of takeoff and I want to cruise at less than 50%. So when I build I will do a large # of parallels 
Cheers from Canada