Hello Marc,
I discovered your work a few days ago and I'm happy there is another crazy fellow who gets interested in the Soleil Royal ! I'm Neko, from France, and my first name is... Marc !
At first, let me congratulate you for the hard work and dedication you put in this project, and I quite know what I'm talking about. I totally agree with you, the process of making something by your own brain and hands is almost as exciting as the result.
Obviously, you're not discouraged by the huge amount of work that awaits you, and that's a good point. First of all, if you want to turn the Heller kit, wich represents the Tanneron version, into a Berain version, it will not be that simple. The question is: do you want your model to be as close as possible to a Berain version, and historically accurate as much as possible, or would you accept a mixed version, knowing that the Tanneron model is historically wrong on many aspects ?
Your drawings are already quite good, but if you're involved in the first solution, I may suggest you a few modifications. Before the settlement of july 4 1670, a first rate three deck ship of the line should look like this:
(image n°1)
This is what you can observe in the side view of the Berain drawing.
The Soleil Royal should have 110 guns. The first deck has 16 gunports, (the first one "hunting gunport" is unarmed), the 2d and 3rd decks have 15 armed gunports. The forecastle and rear castle have 16 guns, the poop deck has 4 guns. Only the Soleil Royal and the Royal Louis have an armed poop deck.
The gunports of the third deck absolutely have their lateral sides vertical, due to the frame of the ship. The bellow and the top sides are parrallel to the decks. BUT, according to the period drawings, on both side views (bow and stern) these gunports are round. Maybe you could find a way to make them round, it may even be simplier than correcting the square ones. Concerning the rear castle, maybe you should delete the first gunport on your drawing, and add two at the stern ? Then you would have a total of five guns on each side, plus the three on each side of the forecastle = 16 guns and you're correct. The gunports of the poop deck should have the same shape, square, or octogonal. I allowed myself to make a few other minor suggestions on your original drawing.
(image n°2)
I know that is a lot of work, and one could quickly get discouraged, but the Soleil Royal deserves it. Given that you want to modify the whole stern and the water line (huge work...) why not mod also the bulkwark to make an even more accurate version ?
I wish you good luck, I will keep an eye on your build and will try to provide some help if I can. Note that I can understand English, and I can barely try to write it without using google translate... But I'm not fluent and I do mistakes... Also, if some sentences seem rude, I'm sorry it is not my intent. Just some difficulties with a language I'm not completely comfortable with. Anyway, I just wanted to make a few suggestions and share the knowledge I have acquired on this ship, and I support your efforts whenever you follow them or not.
Best regards,
Marc