Hi T_bone,
It's like flatliner said; take your time measuring and go slow. I used electrical tube and rope to make a bow to make the cat cuts. There are other more scientific methods but I read somewhere on these forums it's hard to make a true cat cut because of all the external factors messing up (sewing, pinning, non cooperative fabrics, etc) the true cut.
Cat cuts do look sweet :-)
By mid tarp tie out points do you mean the tie out points on the hem or the one or two side panel pull out points?
I have a couple of close ups of the different methods how I attached the tie outs on my blog;
http://opgespannen.blogspot.nl/. Maybe they'll help?
I spaced the tie outs on the hems evenly along the hem; I made one on each corner, then one in the middle and two in the middle between the center tie out point and the corner tie out points.
I'm making a new long sided rectangular wintertarp. With this tarp I want to space the hem tie out points so I can use the corner as doors. For this setup I'll make the ridgeline, pitch the tarp and fiddle until I find the length I need for my doors.
Used this one as well to learn about side panel pull outs:
https://www.hammockforums.net/forum/...ost)-with-pics
I can't find the most helpfull thread but I made the side panel pull outs on my wintertarp using this:
Placing the side panel pull outs:
http://diygearsupply.com/wp-content/...arp-lowres.jpg
I cut four 4 to 5 inch circles out of hyperD 300,
Sewn the webbing loop onto the circles,
Measured the attachment points,
Sewn around the edges,
Sewn a straight stitch under and on the topside of the loop
Hope this helps. Good luck
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