linear bearings holder for aluminium Y-carriage

This thing was made with Tinkercad. Edit it online https://tinkercad.com/things/6n8BAnUlg3l

I'm building a new platform for the heatbed using 2 aluminium plates with 3mm of thickness. The original MDF platform (Y carriage) is too unstable and warped with the time, making it impossible to get the heatbed to be perfectly levelled. This holder is meant to be ziptied to the platform and glued in place too. I'm also intending to build a new heatbed with the second aluminium plate and nickel-chrome