Feel free to copy it , your dimensions would be correct . I have since sold it so can't check . It really was a handy tool , it could also dig a hole , grub out rocks and backfill root ball holes left after the tree was removed . Check out Ebay for 12E Cat scarrifier tynes , they have replaceable boots so your not wearing the tynes down .
Thank you! If I build one, I'll post the final product.