"Jigsaw and good labour, that will do it. I use corragated rain water tanks for circular enclosures, just seen one this afternoon at the dump 'huge', how the hell i'm going to get it home i do not know. Some tanks i cut in half with hinged flip-back mouse wire lids, good for Storrs etc. Larger tanks i cut out the front (normally the size of the opening size depends on how much rust is to come out) and make a walk in style enclosure, mice wire front, sprayed mid-brunswick green, rocks logs and plants and a few uprights, works well. The trick is to make them so you can house anything from a Tree-monitor to a sub-adult lacey - pending size of tank as to what you can house. You can empty them of sub-straight, plants etc, relocate them to sunny area or on the back of a ute. I'm now in the process of building more for Tree snakes; the scrubbies are just about to stay out full-time now. You can then run a electricty junction-box out in the yard to run heat to each cage. Their a cheap caging system thats practical. If i had the cash i would use 'poly-tanks', never have to paint again, and never rust, may replace the wire once in a blue moon.............However their a must for the 'monitor - man'.........cheers Tree.