I originally built this black soldier fly self harvesting compost bin using a bunch of glues, plastic off-cuts, waterproofing, foamafill, silicone, pvc pipe etc for the ramp but it was falling apart and the larvae were getting caught under the waterproofing and between the cracks. The design itself worked great, the larvae loved living in it and munched kilos of food scraps daily but it had issues and needed a rebuild. I decided to gut it all out, saved nothing but the filter and rebuild the ramp out of concrete. Fingers crossed it works well this time round.