How to wrap a DMG file with a wizard installer? I have a question about installers for mac.

I have chromium.dmg which contains Chromium web browser. I would like to create a wizard installer that installs chromium then allows the user to optionally automatically install some plugins, and launch chromium with an initial start page displayed.

To do this, I need a wizard-based installer. 

I found IzPack which looks like it might work? Does anyone have any ideas how to do this? I get that wizard installers "aren't really a mac thing". 

For an example of a wizard-based installer for mac, see SoapUI for Mac. 

UPDATE:

IzPack so far has the installer part rocking pretty great. But the file is a Java archive Jar and many of my users don't have Java installed. Not ideal. I need to find a way to bundle it as a DMG even though its actually a java executable. 

UPDATE 2:

I've got something very nice by using a combination of IzPack and https://github.com/Jorl17/jar2app 

The IzPack builds a java installer but then you are stuck with an executable jar file. That's where jar2app comes in - you can convert the jar to an app file with a bundled JRE. Perfect.
It's not perfect, but I've got something very nice by using a combination of IzPack and https://github.com/Jorl17/jar2app

The IzPack builds a java installer but then you are stuck with an executable jar file. That's where jar2app comes in - you can convert the jar to an app file with a bundled JRE. 

Works for me, not perfect because the installer size gets kinda bloated. And also now you have a .app file which is actually an exploded archive. So you have to wrap that in a DMG. But that works.