I am trying to convert my old Motorola Droid (running CyanogenMod 7) into a device my kids can use without me worrying about them making phone calls or downloading apps I don't know of. My needs are:

1. Disable / uninstall the ability to make phone calls
2. Disable / uninstall the ability to send text messages
3. Disable / uninstall cellular data connectivity (should only be able to work on wifi)
4. Password protect the Market

Is there a ROM out there that already has this, or some pointers on how I can do this myself on Cyanogen?