Hi regarding attaching tie outs on light fabric tents I think simple strong machine sewing can easily do the job. The photo below shows the gentle pulling action of the tie outs and they never leak water.
That is all I have ever used and I have never had a failure. Sorry, I don't have any detailed photos. I do lay-flat Or French seams to join all tent panels ( four layers thick and two lines of stitches). I attach my tie outs where possible to the seam. I make the tie-outs out of scrap strips of tent fabric. (Sounds like the lovely snow skirts that you cut off will give you plenty to work with. I ALWAYS add snow skirts even if they are gossamer light fabric.)
I make the tie-outs in bulk as long strips so that they end up the same width as the tent seams. They start four times wider than the seam and I fold the edges inwards to the middle and then fold one side over the other and sew the strip together with a gentle zigzag stitch, working down the edges that have been folded together. The folding and sewing can be done as one smooth operation as the fabric passes under the foot of the sewing machine. It is far less difficult than my clunky description!
I cut lengths of this strip that can be folded into two and sew together to form an open loop for the guy rope on one end and a joined portion that has a length that is about 3-4 times the width of the French seam. I do them as pairs and fold them into the middle so that there is less stopping and starting of the stitch line then (later cut them in two). I then run the stitching onto the next pair until they are all done without any need to go through the tedious process of re-starting the stitch line. This stitching needs no strength as it will be oversewn many times when attached to the tent. It just stops the slipping and sliding, especially with silnylon, when sewing onto the tent.
I sew the tie-out onto the French seams in the hanging down position. I use a slight zig-zag
stitch and do about 6 there-and-back stitch runs. I carefully finish the stitching run at an even line where the loop forms so that many stitches evenly share that frontline holding roll. If the tent is RTV silicone rubber glueable you can be quite tricky and glue the tie outs on before sewing. This makes the sewing much easier for a crap sewer like me and to my surprise, the silicone is quite nice to sew through even though I had the candle wax at the ready to help if needed.
For premium tie out positions (Bell tent corners for example), before sewing the tie out on I glue disk patches of tent fabric (one to two layers thick) on the inside of the seam to 'share the load. An example of an oval patch can be seen in the post below in the green square Bell ten with the doorway open.
Around the bottom of the tent and the snow skirt (if you hadn't cut it off) I do a triple layer rolled seam with a light zig-zag stitch line. In this situation, I make the tie out strip much shorter and don't pre-stitch the ends together so that the ends can be splayed apart before sew on with zig-zag stitches back and forth along the triple rolled seam.
Here is a post with tents with these tie outs. They have survived the test of time and abuse and wonderful storms without a single tie out failure.https://timtinker.com/ultralight-tent/
Around the bottom of the tent where tent pegs (or sticks in snow) are used to peg the tent down, I tie a small loop of yellow bricklayers line into the tie out so that any abrasion damage from the pushing or pulling of the peg will not harm the sewn tie out and the cord can easily be replaced if needed. They are also easier to find in the darkness and are much easier to thread the peg or stout sticks through. In contrast,the sewn tie out always closes up and is hard to thread when you are tired and have cold hands and a storm on your back.
I treat all attachment zones with dilute RTV silicone rubber while also doing the seams (for my silnylon tents).
Also, Moondog mentioned silnylon glueing. I would like to know of the success or failures of this in the hands of others. It has exciting possibilities by my assessment.
Sorry for such a long reply, but it may help some other keen DIY tent makers. Tim