Hi necko, maybe a good starting point would be to draw a hexagonal polygon curve, extrude it to make a base solid, and then draw some side profiles and use them to boolean out pieces to make the legs.

You might check out the "crown of clubs" video tutorial to get some ideas, it has a kind of similar aspect to it where it covers modeling an item made up of spokes (the club parts). It's not exactly the same but it would probably give you some good ideas, it is available here:
http://moi3d.com/1.0/docs/tutorials.htm

If you want to take an approach of building only one section and then replicating it to make the full pattern, that could work well also... To do that you would probably still want to draw a hexagonal polygon curve which will help you to get a construction reference line (one side of the polygon) to use as a base reference. Then when you are done creating the 1/6th piece, you use Transform / Array / Circular to create the full pattern. See this previous post on making a gear for some illustrations of that kind of technique:
http://moi3d.com/forum/index.php?webtag=MOI&msg=2988.4


I would not really recommend attempting to model all the little scalloped out relief patterns though, you could make some curve designs for a building reference for those but actually trying to model tiny carved out details is not good to do in MoI. Putting those in as some kind of a texture or displacement map in a rendering program is more typical for those kinds of smaller details. If you do want to attempt to model those relief pieces you would probably want to export your base shape to a brush-based sculpting program like 3D-Coat, ZBrush, or Mudbox and then use the sculpting tools in there.

- Michael