Thanks for sharing – glad it worked out so smoothly – and welcome to the forums! 
Somewhat related, am linking in the recent notice about changes to Legacy backend services as yours is a great example of a successful FreePBX upgrade from quite a few cycles ago. (Tried to find the exact date that 2.11 went EOL but close as it gets looks like this topic Is there any EOL(end of life) announcement for freePBX 2.11? – anyhow, we’ve come a long way since then and now provide much more transparency around the planning of FreePBX Versions in response to feedback from community members.)
Please consider hanging around for a bit and continue to contribute your experiences with v17. Or at least come back in a few more years to check in! 