Cartesian_330X330 bed - v slots and mgn12 rail

I join all thing I use to built my 330mmX330mm bed Cartesian type printer - I use V slot 2020 profile and 2040 profile to built it , most of the part I remix other thing ,
the bed heater is silicon 300X300 750watt 220v and I connect SSR for it ,
I build box from old computer and cut it to half and put ramp1.4 board in it , also use the original computer power supply ,
I used these aluminum profile
2040: 2 x 450mm, 2 x400 ,
2020 : 3x 500mm , 1x400mm 2x 450mm .
( 1 of the 2020 profi