Automatic CHICKEN DOOR Dirt Cheap

My goal was to make automatic chicken door as cheaply as possible. In metric.
Things used: [please check if it matches, i bought these things a long time ago]
-2x bearing holder or rail support; inner diameter 10mm-2x bearing MR105 inner diameter 5mm10mm-M5 rod-6X M5 nuts-shaft coupler 5mm 5mm-sink chain; L at least 400mm -polycarbonate 210X300 -stepper motor 28BYJ-48-2x L profile as stepper motor holder-2650mm alu profile for sliding, edges at 90degrees-photoresistor sensor module-some wires with female headers-Arduino UNO-some screws-a board “