If I knew exactly how to set up and where to place the specific individual platform partitions, then I might be able to use one of them.

I am aware of and own the commercial application iPartition, and obiously have access to fdisk and gpt amongst other command line utilities available for use which likely could do the job.

I found a nice tutorial for creating a multiboot usb thumbdrive via Linux that will boot OS X on a Mac, and Linux or Windows on PCs or Macs, and obviously, if I already have a Linux virtual machine, I could use YUMI as indicated in the tutorial (and I have seen other, similar tutorials that use a similar utilities to do this from Windows like SARDU and XBOOT), but I am hoping to discover a similar OS X native method or application that accomplishes the same thing. I need to be able to create the image in one step to include multiple bootable OS installers (various multiple versions of OS X/Windows/Linux/Linux based Recovery Platforms), all from a single OS X machine. I would like to be able to create a disk image (that I can transfer via Disk Utility.app to a large USB storage thumb drive) which is a multiboot installer for provisioning various operating systems from a single USB drive.

Create mac os usb for another mac