Greetings,
At first I would like to thank you for inviting me to your's project.
Before I will place my final bid I would like to know a little bit more about your expectations.
1. Are you aware of existing "out of the box" solution? There is an official Zendesk app that runs flawless. Setting up it will take just few hours for any salesforce experienced person.
2. Or do you require custom solution? In this case it would take approximate 50-150hrs of development and testing. That would probably exceed your budget.
Once again, thank you for inviting me. I hope to hear from you soon.
Regards,
Greg Drygas