Today I decided to redo my CNC bed. I laid an entire piece of MDF down then screwed in the t-tracks to the top of that asking with since more MDF spacers between. This way I should never have to replace the MDF below it. I also placed the first and last T-track outside the cutting area. This allows me to easily clamp down without losing any of the cutting area. And if I ever need to move the t-tracks, it’s easy enough to just unscrew that material and move it.