Two important recommendations:
The pattern says to begin some of the new colours on the wrong side of the shawl. With garter stitch, this means that the separation between the two colours is not nice and tidy on the right side! You may want to change the pattern instructions to beginning new colors always on the right side.
Very important:
I’d strongly recommend knitting the first few rows of the lace part (maybe 14 or so) after you picked up your stitches from the the garter stitch center triangle VERY Loosely, or maybe in a bigger needle size (or maybe even increase a few stitches, but then you have to calculate so that it fits with the old shale chart), so that these rows can stretch. Otherwise the center triangle will be too wide, therefore curved, and you will have to fold the center when you wear the shawl because there is too much fabric in the center. Which is a little annoying. You can see this in some of the other projects, where the other knitters wear their shawl - they often folded it where it sits at the neck.
Also important:
There is errata in the instructions for the applied border: For the first row of the chart to end with a slipped stitch of the body of the shawl, you need to cast on 18 sts, not 19, because in the first row there is a yarnover which is not eliminated by a corresponding k2tog. (Row 16 also ends with 18 sts plus one knitted-together stitch of the body of the shawl, btw.) It is weird that I have found nothing about this anywhere, nobody mentions it, and it has cost me an evening of disbelief and restarting over again and counting.
Another tipp: Install a lifeline in the last row before you start the “old shale” pattern (plus in the last row before you start with the applied border). So if you do have to tink back, it will be faster. 
With the handspun lovely alpaca based yarns I bought from some lovely ladies during a summer holiday in Ameland, I wanted to make a somewhat rustic and traditional shawl because I think it is very fitting.
07.09.2022
At first it was hard for me to believe that the second part of the “old shale” pattern can be knit by simply repeating the first part, just as it is, from right to left.
But if you don´t mess up and get lost in the rows, like I did, therefore missing a few YO increases, the pattern does stack up nicely and stays within its stitch marker boundaries! 
(I started a thread about my problem of the repeats not stacking up here.)
14.09.2022
Ok, since I saw I don´t have enough yarn of the greyish tone to be able to knit the very wide border, I had to redistribute the colours somewhat. See the “colour planning” photo for this. In order to stay within the same stitch count, I have redistributed the colours and not added any rows.
I have changed:
knitting chart first time:
Grey (10 r): starts r1
Black (18 r): starts r11
Grey (6 r): starts r29
White (14 r total): starts r35 (this is 6r for the first passing of the chart)
knitting chart second time, starting from r5:
still White (14 r total): further 6r
Grey (6 r): starts r13
White (14 r): starts r 19
Grey (8 r): starts r33
25.09.2022
After having completed the scalloped lace applied edging chart twice, I have weighed my chocolate alpaca ball.
It weighs 131 g.
I hope that will be enough…
Edit:
It won’t be enough, because I need 6 g for one repeat of the chart. So I have to make the chart shorter to accommodate for that.
29.09.2022
Ok, so since I specifically wanted to knit THIS shawl with THIS yarn from Ameland, I decided that I will definitely make the border more slim instead of looking for another yarn to buy.
09.11.2022
I did make the border smaller, but had to admit to myself that the alpaca yarn will not be enough for this either. Which was really a pity, because I really liked to knit the applied border, it was great fun.
So I contacted the organizers from Ambachtelijke dag in Ballum on Ameland, and they were able to connect me to the lovely lady that spun my alpaca wool! 
I will send the lady a sample of the alpaca, and she can afterwards tell me if she has more to sell! I am very happy about that.
21.11.2022
Today the order from Ameland arrived - the lovely lady sent me one cake of dark brown alpaca and one cake of greyish alpaca & wool - so I could even make the shawl larger! 
Unfortunately this means reopening the border again, but, to be honest, after all this time I spent waiting and hibernating with this shawl, this doesn´t matter anymore.
31.08.2023
Ugh, the applied border, as it is, eats up so much yarn! I had about 28 sts of the border bound off this way and had to face that I have to rip it out again, because with the irregular handspun I have here, it will probably not be enough yarn for the border. So I’ll try again making it slimmer.
14.09.2023
I bound off! 
Yay!
17.09.2023
And it’s blocking! 
Will leave it blocking for at least one week, as I’ve heard from Shetlanders that if you take it off the blocking mats too early, the lace will close again. They leave hap shawls blocking for up to two weeks, from what I’ve read from Elizabeth Williamson on Insta.
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