thanks for the comments...we used hardboard for the actual tank....everything inside is from our garden (the big rocks and stones) We baked them first and they were washed thoroughly. The plexi glass is fantastic to make the sliding doors at the front, and they are so easy to clean. We nailed the logs to the wall at the back, so we have no worrys of them going anywhere!! It was fun to build and its even better now that the beardies are in there! They seem to love it.......x