DIY double glazing with perspex (full DIY double-glazed windows not just secondary glazing)

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I'm building out a Luton van to live in (pic attached just so you get idea). I wan't a lot of natural light.

Campervan windows are too expensive (I might get a couple but want more light than that). Proper double glazed windows cost too much too, even for just the glass, and I'm also trying to keep the weight down as much as possible.

My idea is to make windows myself from perspex.

My plan is simply to cut the aluminum body of my van, replace it with an outer sheet of perspex, and then do the same on the inside wall on the other side of the insulation. They don't need to open and close. I am thinking to not bother trying to seal the gap so it's air tight, since I'd be worried of condensation and moisture getting trapped if I do.

One thing I want to do is put a window across the whole front section above the cab with one big outer layer of perspex.

Other than imperfect heat-loss qualities (and I'm not sure how much loss I should be expecting here), what are the flaws or dangers with this idea?


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Another bonkers idea would be to buy a cheap caravan maybe one that leaks and is beyond economic repair and rob the windows out of that as well as the cabinets and other stuff
 
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Yes, it's not uncommon to see caravans for free on Marketplace though there may be some cumbersome logistics involved. Also there are plenty of secondhand windows on ebay, making one seems like a recipe for disaster.
 

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