L brackets which are then plyed over, 8 x 12 would probably be sufficient, sorry 200mm x 300mm
Won't that leave the ply a bit lumpy?
no, because you'll
a) rout slots b) chisel slots c) lazy option of stair tread grippers as spacer
@Backstop started
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L brackets which are then plyed over, 8 x 12 would probably be sufficient, sorry 200mm x 300mm