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In my use of your box, I came to realize that I wanted to easily customize the boxes I was creating (especially disk size). So, I parameterized HDD size, Swap Size, and Memory size to simplify my life a little bit.
I also noticed that when I downloaded the Virtualbox guest additions iso, the name used an underscore instead of a hyphen, so I changed that as well.
I also noticed that the virtualbox iso (that I downloaded) had an underscore instead of a hyphen, so I changed that as well.