My old stacked home made plywood 4ft x 2ft x 2ft tanks are over 10 years old and look really rough and not really nice to look at. Time to build a double bay for my two central bearded dragons and for my two eastern bluetongues, I want something solid and at the same time nice enough to look at that they look like good furniture. I've settled on my bays being 1.2m x 0.6m deep by 0.5m tall for the dragons , and by 0.4m tall for the skinks. I'll do modular builds using Connectit 1" joiners & 1"x1" square aluminium tubes (structure), Perspex for sides ( will use screws to fix in place to aluminium tubes ) and plywood top and base , sliding glass / Perspex front doors. The base will be built accommodate a 25L under bed tub , and will be made from 75x200mm offcuts for 75x200mm Sienna sleepers and plywood , and on casters. The standardized base design : The format shown is for my family area , the format will have provision for two 25L tubs to roll in / out from the front for the other that will be placed with it's back to a wall ( butting against a single 75x200mm x 1.2m with the sleepers forming a E shape. ) Advantages are : * very low centre of gravity * mobile * very strong structure * modular design * makes good use of waste timber offcuts from the sleepers used to build a bunch of raised garden beds and retaining walls in my front and back yards ( timber that would otherwise go to the tip or be broken up to be burnt , 75x200mm sienna sleepers are expensive ! ).