I will be going down to Cornwall early March and could deliver new one on my way as i build them to order, here is photo of a 40" one available now and can build a 4ft one for you. They are made from 18mm conti including the rear with internal bottom and rear edges sealed with silicone, will drill all holes required so it will be ready for snake - just need heat mat and habistat to control temp of heatmat - add a snake and your off!.

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Runners - vents - fittings supplied