Thank you!
I definitely still need to work on organising my work when drawing on several sheets.
I have found that it is best to start with the bottom right tile and draw the sheets from right to left and bottom to top. It is then easier to put all the pieces together.

I've just uploaded a large scan (6374x9000px) to Deviant Art. Link here: https://www.deviantart.com/mapyniepr...arna-874729424

You can look at the details if you wish.