No easy way to say this but your Z axis looks particularly -er- "unlikely". I think you may be just about to make a big mistake.

Basically, the fixed part of the Z above the bed should be at max material thickness + a tadge for clearance.

The Z axis travel should be max material thickness + max tool length + a tadge for clearance.

Do not over-estimate these maximums because you think it will limit the machine. Over-estimation leads to overhangs that will weaken it so much it may not want to cut anything harder than cheese.

OTOH I haven't read the whole of this thread. If you are planning on cutting foam patterns with a 6" tool it looks fine and dandy apart from the minimal vertical separation on the Z blocks.