Integrate Ubercart/ Google Checkout Subscriptions

Hey all. I'm looking for an estimate of how much time/cost for integrating:

* Ubercart donation module: http://drupal.org/project/uc_donation
* And Google Checkout's Google-handled subscriptions (http://code.google.com/apis/checkout/developer/Google_Checkout_Beta_Subs...) with the UC Google Checkout module (http://drupal.org/project/uc_google_checkout)

I envision an individual be able to choose the option for a recurring payment attribute when creating a donation node. If it's a recurring payment, Google Checkout sends the appropriate XML and the subscription is created (and handled) through Google Checkout.

Workable? Thoughts? Questions?