How Big of a Tarp?

[fin]

A couple of questions not related to size, but tarp construction in general:

- Should one put a cat-cut on the ridge (albeit, a shallow one?) If not, why not?
- Assuming one has chosen to use grosgrain ribbon at the perimeter: is one or the other preferable - nylon or polyester? Or is there even a difference in this application?

The best tarp design I've seen is either the Speer Winter Tarp, which Youngblood can verse you on, or this:
http://www.hammockforums.net/forum/s...ead.php?t=4364

The Black Cat does have a slight cat cut from the ridge to the corner tie-out.

Nylon has a little more stretch in this application, so might be slightly more forgiving, but if you use tarp tensioners, the grosgrain shouldn't matter. Again, I defer to Dave (Youngblood), as he is an expert on tarp design.