Heated Bed Clips

Clips to secure a heated bed to a i3XL RepRap printer when the bed layers are different sizes.
The printer bed is 12" x 9" (305 x 228.5mm)
The MakerFarm heater is 12.6" x 8.4" (320 x 214.5mm)
The 1/8" borosilicate glass sheet (purchased from from McMaster-Carr, part #8476K84) is 12" x 8" (305 x 203)
The 1/8" sheet of cork insulation is the same size as the printer bed.
The countersunk sheet metal screws used are 4 x 1/2"

Duplicate the design when slicing to get clips for all four co