If it was me i'd leave room for clamps. There is always going to be a reason why in some instances you either can't use vacumn and need to clamp things down. There will be instances where you will make jigs to hold smaller peices and need to clamp down those jigs.
I'm not clear on what benefit you gain by covering the whole surface? Your carriage will only go so far over anyway.
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