Hi Kaloyan - My issue is resolved thank you!
It seemed to be only ios for some reason - but perhaps this is because I had deleted the iOS app and not my Android app.
Then I saw this thread with other's having ios issues.
The final message in the build output said: Error: Error: Can't remove "/tmp/builds/Cy9Hfl4lBBNQqZcrQ0/provisions/......mobileprovision": EACCES, unlink '/tmp/builds/Cy9Hfl4lBBNQqZcrQ0/provisions/9.....mobileprovision'
Maybe there can be a better final error message?
Anyway - thank you for AppBuilder - overall it has made things much easier. Cordova 4.0 builds seem to be working for me now and I have ionic, cordova 4.0 and crosswalk all working along with Visual Studio debugging (which is a little buggy - sometimes it works sometimes it doesn't).
Overall it's a great toolset - it would be great to have offical support for ionic and ngcordova and also if when running in the simulator if you could hit breakpoints in Visual Studio that would be amazing.