Thank you all so much for the lovely comments.
Veggiechef: you are totally right. The granny squares make this project a wonderful thing to work on. Also I prefer working away loose threads during the process (so you don't have to do all threads at the end
and I would looooove to see some results if anyone is going to make one
Another suggestion: you can also make it with cotton wool so it's no big deal if you finish the plaid in summer