I will say this, instead of doing all these upgrades, I would probably just purchase a Shapeoko 3 XXL. These were not available when the current generation of the X-Carve was released. The Shapeoko 3 XXL has most of the common upgrades people due to their X-carve (stiffer extrusions, 9mm belts, larger steppers), it’s way bigger, and also has some nice design features like inboard steppers, which the X-carve lacks. If this was an option when I purchased, I might have gone that route instead. They are more expensive, though, at around $1,825 with a Makita RT0701C. But as far as the X-carve competition, this is definitely it. When it comes to V-wheel based CNC machines, this is about as much money as I would want to realistically spend on them. Once you get much more than this, you really should be looking into linear bearing, screw, or rack and pinion motion machines. V-wheels are budget based and limiting as far as rigidity.