How much does the order of kraken tentacles matter when constructing them? Should it be clockwise from the bottom left corner, or having the middle cannons on the deckplate be the innermost tentacles?
The order doesn’t matter at all for those. You can place them wherever they fit.
Because they can only shoot something that’s surrounded, the target will always be within range of every tentacle, and removing specific ones won’t alter its lines of fire any any meaningful way.