Hello,
I have more than seven year of experience of Google merchant, Google analytic and Google Webmaster tools. I had done a lot of similar project in past i can share reference url in further communication. Simply search my profile name(kumarmanish0001) in Google you will see my work and client feedback.
I will create product feed for all variant. I will need WordPress admin access and Google merchant access. You need make payment as soon as feed get approved by Google.
Thanks
Manish