Free Version and in-app purchases

Researching building a free version of an iPhone app and a paid version of the same app that includes in-app purchases.

I got started by copying the target bundle in XCode to create MyApp and MyAppFree. One of my first questions is, how do I handle the bundle id and app id? Found this at StackOverflow that sent me in a slightly different direction:

http://stackoverflow.com/questions/2146097/app-id-and-bundle-seed-id-in-multiple-applications-with-aspn-inapp-purchase-and

particularly:

"…Apple has frowned on having both a "Lite" version as well as an "in-app" updatable version. One or the other. Recently they have been pushing the "in-app" updatable…"

uh oh ... led to this:

http://www.tuaw.com/2009/10/15/apple-relents-in-app-purchase-for-free-apps-allows-demo-to-paid/

So, can have one version of the app instead of free version and full version.

Next read was "App Store Quick Reference: Getting Started with In App Purchase on iPhone OS".

https://developer.apple.com/iphone/news/pdf/in_app_purchase.pdf

http://developer.apple.com/iphone/news/appstoretips/

I read no definitive prohibition against building both a free and an in-app purchase version, but feel that I should be better safe than sorry.