After a change of plans, going to use a tent, I've picked out a Mylar eziTENT 100 x 100 x 180 cm (The deal breaker for choosing a tent over making a DIY because it would be easyer to move, because I might be moving house soon)
http://www.ezirange.com.au/ezitent/mylar-grow-tents-ezi/
I'm going...