Dropbox is your friend and I have it installed on both my Nexus7 and Windows system. It also creates a special folder on windows that automatically syncs to the cloud whenever a file is dropped in.
Export your project as a CocoonJS zip file to the dropbox folder. The file should sync to the cloud and be available on your Nexus7 (or any android device with the cocoon app.)
On the Nexus7, run dropbox and look for your zipped file. Important, Press and hold the filename until you get a menu. Select 'export' and 'Save to SD card'. The file will be saved in the root of the Nexus 7's internal memory where the CocoonJS app looks. Close dropbox.
Lastly, run the CocoonJS app and select the zip file.