
Look at the 3, it's a square not a circle.
It starts to look like circles with number 13, the others are shapes with 8 edges.
He wants to use wedges, not default bricks, it'll look way (or not) better.
Actually nearly everyone could make you the model, but like noone knows how to get the stuff and textures correct in the .blb file, I hope they release the BLB Tools.