When building for iOS there is no module apiversion validation being performed, this is because the apiversion in the SDK is stored as iphone, and node-appc is looking for ios.
1. Add the following module to your tiapp modules section <module platform="iphone" version="1.1.0">com.appcelerator.aca</module>
2. Open the manifest file (probably at /Users/eharris/Library/Application Support/Titanium/modules/iphone/com.appcelerator.aca/1.1.0/manifest)
3. Change the apiversion to anything other than 2
4. Build with ti build -p ios --build-only
Build carries on past the module verification stage
Build should error that module is incompatible