I had to move some of my septic lines. My tank was able to be worked around, but moved 4 septic lines. It was 8K. I had to have a permit to make sure that there was enough septic field and county board of health had to inspect. My septic people handles that. My personal challenge, was that I had to remove trees to move the septic lines. My city had JUST passed an ordinance that any tree wider than 6" required a tree removal permit. Could not get the permit for the trees until the septic was approved, as I had to be sure what trees had to come out. I did not want to pull trees and have to revise the plan.
If I did not move my septic lines, the pool would have been much smaller and way over on one side of my yard. the whole process took about 3.5 weeks for permits and service. The total cost was about 11K (still have to replant some trees). It was a bitter pill to swallow, but in the end, I am quite sure that it was worth it. In all reality, you will probably NEVER move your pool, so why not build it where you really want it.
your design is beautiful. I agree with someone else here, that if you can upgrade to a pebble finish, it would be a good idea. It all adds up so quickly!
I had to meet with 6 pool builders before I found one that I liked. 2 of them never really provided plans. The one I chose had to re-design the plans about 10 times before we came up with one that I really liked!
Good luck with your pool. Your current plan looks like a lot of fun!