I was able to release an app on google Playstore with Admob integrated ad it is flawlessly working, why to go to eclipse of cocoonjs is the final step?
This is the tutorial I "Carefully" followed and it worked fine.
tutorials/781/how-to-setup-admob-ads-on-construct-2-mopub-cocoonjs
If you need any help there are many willing to help, try this and if it doesn't work reply to this thread and I will be glad to get you through with it.
My app on my signature "Stoorn" created by C2, exported on Cocoonjs, integrated with Admob. you can check it out as an example.