Hi,
What a nice idea! I love to work on this kind of innovative projects.
I have 13 years experience with CTI (Computer Telephony Integration) and web development, I have solid work experience with Asterisk, Freeswitch, FusionPBX, A2Billing and FreePBX
Regarding current project I think I have to create following
1. Discovery GUI
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Where you find and tag your chromecast devices
2. Chromecast selection in GUI
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While creating / editing extensions, there will be a select box, which will allow admin to select / bind desired chromecast devices with current extension. ofcourse this box allow to select multiple devices.
My estimation of this project is approximately USD 400 / 4 days. However I also have no problem working hourly.
Regards