I've also always used 10mm thick 'twinwall' polycarbonate sheet for cold frames a as it is hundreds of times stronger than glass and is easy to work with. My main frame still has the same top, even though I've had to replace some of the wooden sides which have rotted away during the 30 years it has been in place.
A trowel in the hand is worth a thousand lost under a bush.
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Wisdom is not putting it in a fruit salad.