The tentacles have been assembled successfully and everything worked as planned except the webbing for between the tentacles. The webbing was just too stiff, too big and doesn't look good. Going to leave them off for now and will print smaller, thinner ones in the future.
The tolerances for the tentacle mounts and hub were more or less good but the matte finish makes a slightly rough surface and I had to do some additional sanding and cleanup. Also used a little grease on each mount to help the fit. Check out the photos: