The front chamber would be the volume of the air space between the cone and the baffle if there is no other separate compartment. The front chamber size in combination with the throat size affects LP filtering and Fs alteration.
Xmax is a one way measurement but it is only considering the voice coil overhang, not potential excursion. Some manufacturers list the destructive Xmax, which is when the coil hits the backplate, and that's the depth you'd use for the spacer,inclusive of the driver gasket. If you can't find the destructive XMax then go with twice the regular XMax to be safe.
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