each piece is approx 14cm x 15cm. i made them this size as then four pieces would fit onto one piece of a3 card.
the final lamp measures approximately 70cm across.
if i was going to make it again, i would probably make the pieces slightly bigger than this. the lamp fits into the room well as is, but i think as it's such an intricate design, it would work well being slightly oversized for the space it's hanging in (if you know what i mean).
also, the card i used had a cream tinge to it, which was not so apparent until the shade was lit from inside. consequently, the light given off is a bit yellowy which is not so great for a dining room. I would source some different card if i did it again probably.
the bulb i have used is 60W, but i've got it on a dimmer switch and it looks loads better when the light is turned right down.
hope that helps!!