Sometimes in our little ship scales, 1/350 and especially 1/700, we just have to, well, eyeball things and do the best we can. And adopt more of a "close enough is good enough in this size" mindset. Which is hard to do, because most of us are (usually overly) dedicated to Getting It Right.
I've had to adopt this mindset while scratchbuilding a number of itty-bitty details for the auxiliaries and cargo ships that I favor, and realize that I am building for me. The 99% who look at your models are going to say, Wow, that's damn fine work, and not know the difference between what is precisely correct and what just looks good. The 1% who do know the difference will accept the explanation that you did your due dilligence and this is the best you could come up with.