Thank you everyone for the responses.
These past few days I did some work on my Polaris. Firstly, I have attached the bulwarks. Can't say that wasn't stressful, but I did it. I put them in the water for 15 minutes, then bent and dried them by ironing. Moment glue at the ends of the bulwark was a game changer for me to achieve full contact.
Then I started the planking. It is both an exciting and quite difficult stage for me. Same as with the bulwarks - water, bending, ironing. What is difficult for me is pushing the pins. Half of the time it goes not the straight line that I am aiming for and through the side of the bulkheads. So far I see no damage that I should be afraid of, but it annoys a little bit. I am using a pin pusher from OcCre, maybe I just need more practice. The problem is probably not with the tool?
Now I have noticed something. I should have bent the bulwarks more towards the stern when I was attaching them and glue them not within the planking area. Now there is an angle and a gap between the back of the bulwarks and the planks, but not a smooth curve:
My question is - is it going to be alright and I will have a chance to adjust it by sanding, or should I cut the excess part (it is not really long) of the bulwark (I have marked it red) that is in the planking area and attach the plank instead?