Even with perfect measurements it’s impossible to get to that line straight unless the frame is perfectly square. This not only completely solves that issue but also saves a ton of time not having to measure and cut them one by one.
Also the lumber I picked turned out to be 10 cm longer than the deck and I even picked the exact right amount. By the time I was done I only had a basket of <10 cm off-cuts.
If you don’t mind the tactical look you can’t go wrong with Savotta. It’s a Finnish brand that makes outdoor gear for hikers and the Finnish army. All made in Europe. Check out Jääkäri S or Niukka 20L for example. Guranteed BIFL.
Sold at Varusteleka for example.