Pole mod:
The attachment points have to be sewn on the tarp, for sure order the tarp with them. Sewing them on after is a bit tedious from what I have observed. It's little more than some folded grosgrain sewn to a reinforced area on the tarp.
Wilderness Logics pole set uses buckles so you'd have to have those sewn on to the loop on the tarp. Really any grosgrain loop with an amsteel continuous loop or dogbone is sufficient. So the DIY method of keeping it simple works.
No experience w/ a DD tarp, can't help you.
Here's an example of the WL tarp pole kit.
http://www.wildernesslogics.com/TARP...OD-KIT-TPM.htm
Can get measurements tomorrow but a search here on HF may yield something faster.
Only thing I'd pay attention to is making sure you have enough room to keep the poles off the ridge of the tarp when setup. If the poles press down on the ridge, you run the risk of creating a leak. A couple factors are play here, creating a gathering point for the water to sit in an extended downpour, quality of your seam sealing, was grosgrain used to sew the ridge, etc.
If you go with an inside pole mod, make sure you get a light enough pole, too heavy a pole puts too much stress on the pockets. I've actually had a pole tear through a grosgrain pocket. Too much tension isn't good, it creates a nice tarp stake launcher. Also, nice to have a tie at the inside center peak if you are going with a single inside pole mode. Prevents the pole from wandering.
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