Gene,
I thought the same thing at first but given my limited knowledge here are a couple reasons i think i'd rather have a seperate total unit.
From what i've read and see (youturd) you absolutely must have an extremely level surface to begin with.
Also you need a "climate controlled" environment for this to work optimally in. In other words, like in my shop in the winter i have no real good heat source other then one of those "jet heaters" that spits out heat then shuts off.
From what i've read there are issues with the heating of the material in the application process and a need to have it cool down properly. Having it in a cold environment i think would create problems. So it would be better in your house or basement shop instead of out in the dusty cold shop.
Words of Wisdom:
“Words that sink into your ears are whispered…… not yelled”
“The biggest trouble maker you’ll probably ever have to deal with, watches you from the mirror every morn’n”
“The only difference between a rut and a grave is the depth”
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Just remember...when it's time for the hearse to pull up..there's no luggage rack on top!
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The beauty of the Second Amendment is that it will not be needed until they try to take it...Thomas Jefferson