I've checked some of my tables, my small 16.535in x 9.055in x 1.9685in (420mm x 230mm x 50mm) mill table weighs 68lbs, my rapids are 590IPM, when the machine was not bolted to a pedestal it would slide across the floor during rapids and the machine weighs over 600lbs, using a GT2/GT3 belt would be an exercise in stupidity, but, if you think it wont stretch or bounce knock yourself out and let us know how that works for you moving something that has any weight.
I have some larger tables upwards of 135lbs (24in x 16in x 2.5in) with 590IPM rapids and 100% table travel, there is no way I would put anything less than HTD8 as a drive belt or anything less than 1.5KW servo motor to move it.
Now ignoring the issues with inertia alone, if you don't program your mach3 or linuxcnc to have a fairly mild acceleration/deceleration curve you're asking for trouble because if it's aggressive you can kiss that belt good-bye quickly.