Nice looking tab.  And that is an outstanding video on how to make a single loop string.

Now find one where he shows how to serve the string.  That's wrap thread around the string in the area where you nock the arrow.  And while you don't need as many strands as he does as far as strength of the string goes,  I usually use 14 strands in my strings in my much lighter bows simply because a slightly thicker string doesn't dig in to my fingers as much while I'm shooting.

How's the arrow situation? You planning on making those as well or buying some?

So long as there is enough room for the arrow to shoot cleanly with the added plate and rest I would. The wood will take wear there if not.  I've never glued over an oil finish so double check this but if it was me I would make sure it's completely dry, sand the area a bit and use contact cement or shoe goo. If you have a heater fan the oil will dry a lot quicker. Anyways that's the procedure I would follow. Should be fine.

I found another use for leather that's archery related! Turns out thumb rings were, and still are, sometimes made of leather rather than wood or bone or antler or some other material so of course I had to have a go. I made a quick paper template, just to be sure of the dimensions, then cut out the leather, punched two holes in the "arms" and sewed them together. It literally took less than 10 minutes to make and, as far as I can tell with the very quick pull back on my bow with the stand-in string, it seems to work fine and I might even prefer how it feels to the finger tab. Of course I need to try them both out for real before I make any decisions but the mechanics of it seem to make sense for me and I think I might get a quicker, smoother release. Need to see. I think it's obvious at this point that I'm desperate for the string material to arrive. I'm going to try and find some arrows tomorrow but I'm not sure how good an idea it is. It's going to be torture...

Now added some leather to the arrow rest with some glue and I can now say the riser itself is finished! I'm so happy with how it's turned out.

Finally the b50 arrived!

It took 2 attempts but I finally got a half-decent, sort of ok string. I'm hoping the serving string will be arriving soon so I can finish it off properly. Then all I need are arrows and somewhere to shoot!