You mentioned that there will be a lot of built ins ... and then it'll be too late for changes!
Not really ... built ins can be made so that they are not permanent, yet are solid for your use and seem permanet.
Then when/if the time comes and you want/need to rearrange them, you have the potential to easily move them. And once again, they become "permanent" .... til the next need arises!
You may think now, it's the long term plan ... as a new quilter, you'd be best to allow for flexibility for the future, whether for quilting, or some other avenue your interests take you!