The script looks good.

You are asking for problems: It could be, that mount-sd.sh is executed very late at startup of the device. If other processes, that are started before mount-sd.sh is done, need some files from /home/nemo, they would read the "old" files from the tempfs.

At the moment, I am only using the /data/sdcard rebind for android (cite from post #2) and have some symbolic links at music, videos and pictures. I had two issues with that.

1. If I create an ambience from a picture on the sd-card, this ambience is gone after reboot. Thats why I think, the mount-sd.sh is executed too late. If I copy the picture to the picture folder (tempfs) and create the ambience, it is persistent. You should try, If an ambience if persistent with your conf.

2. I advise to use the .android subdirectory for the /data/sdcard rebind, like you did in your script. Because: I did an uninstall of the android support an all android apps. Then I did a new install of the android support. After that the /data/sdcard folder was *completly* empty. The android support deleted the hole folder, I think. I had some pictures before uninstalling and installing the androis support in that folder, but everything was gone, not only the folders of the android apps. If someone binds the root of the sdcard to /data/sdcard, do not uninstall and install android support, before you have a backup.