I get a3 sheets of 0.5mm polycarbonate of eBay for £4 and make my own. Make up a wooden template of your undertray, sit the sheet ontop stick it in the oven on 150 degrees C and after bout 10 mins the sides start to fold around the wood. Once done run, quickly put it under tap and it stops shrinkage. Then just cut away the excess. Finish isn't as good as thermoforming I know, but I've got a db01 and nobody makes undertray for them. It's nicely sealed all round now and chassis is still like new. Hope this helps
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