mudrat bumper tubing diameter?

i was just wondering if anybody has a mudrat tube bumper or something similar hanging around? my brother just got a new mandrel bender, and im itching to fab up an o/r bumper for my forester. im curious to know what size tubing mudrat79 used. Looks like the perfect diameter because of course weight is always a concern. And ive looked for some kind of reviews of his stuff that describes the weight and material used...but found nothing. I've got a ton of 1.25 schedule 40 and 80 seamless that I've built some truck bumpers, cages and misc. things out of, but i think its probably a little too heavy. So any advice or experience with the mudrats bumpers would be greatly appreciated. Thanks in advance.