It seems like you would have two choices. You could create a batch file that included all of the installs, and deploy it as a single application. Or, you could create three separate applications and use dependencies to make sure that they deployed in the proper order.
I must be reading the reply from Garrett804 wrong because it seems like he is saying that only an .MSI can be distributed using the application model. This must be a misunderstanding on my part because you obviously can distribute a script or an .exe installation using an application.
