I might try to make one again too. I did try the camping mat idea, but dont use it as kept flying off. Hadnt been bothered using the velcro.I also like the look of Sabs more professional job.
There are a variety of materials at Bunnings to use, so might have a look today, but need the velcro to finish it off this time.
Re warm clothes - luckily dont have to worry too much up here, although mid year temps can get down to 13 thereabouts.