Number Obelisk 1 to 10 arabic, roman, dot and lumberjack numbers

Number Obelisk from 1 to 10 using arabic, roman, dot and lumberjack numbers. Made with SketchUp. Needs decoration on bottom and top. Thinking of making more empty pieces.
Pieces are quite tight so three years on might work fine. On some pieces you need to use knife to fit them better.
Pieces were loosen before this iteration but the obelisk fell and looked like pisa tower.
Suggestions on geometric between pieces.
http://en.wikipedia.org/wiki/List_of_numeral_systems#By_culture
a new des