Feel free to PM (or email: [email protected]) if you have any specific questions on that design, or building tarps in general. I'd be glad to help with any detail questions.
You can do it as simply as using scrap from your tarp material, but I do recommend a heavier nylon instead. I am using 200D Oxford Nylon for my tie-out reinforcement pieces (and will be selling it by the yard in the store soon). The Oxford works very well.
As for webbing loops - Grossgrain does work, it's just not as strong as actual webbing. If you do go with gg, I recommend you double it up for the ridgeline tie-out as that sees a lot of stress compared to the other tie-outs.
The most difficult part of building a tarp is simply the sheer volume of material you have to work with. And I suppose for some the slipperiness of Silnylon can be difficult at first - but it becomes second nature after a while.
Enjoy!
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