well spent bunch of time in finishing parts and researching regarding the pulley mechanism to moving the heatbed. But still i havnt figuired it out that which heat bed to use. there are plenty, many with proprietary connectors or requires custom elctronics(besides open source code for the controllers). Well i will make the base design add constraints and finilize the hotbed on the fly as i like. IF you have any idea which to use pls tell.