Developing Monotouch and XCode in parallel - how to set it up

Would it make sense to develop an app in Monotouch and With XCOde in parallel or with Monotouch as a prototype. (I would be learning both while developing).

Since both use the same开发者_如何学Go interface-builder. Could I just take the files and create a SDK version from the same interface files the same way just after?

How can I set it up so that I share as much as possible (Locally and/or source control).

What should I use of test-tools etc? (So that I can share my tests?)