import rhinoscriptsyntax as rs 
allobjs = rs.AllObjects 

#draw a closed curve in Rhino
rs.Command("_Curve Degree=2 0,0,0 70,0,0 80,20,0 20,20,0 10,30,0 10,100,0 -10,90,0 -10,20,0 Close _Enter")
crv = rs.FirstObject(select=True)

#extrude the curve
rs.Command("_ExtrudeCrv Solid=No 300 _Enter")
srf = rs.FirstObject(select=True)

#create contourlines in z-direction and extrude them (floor plates)
rs.Command("Contour 0,0,0 0,0,1 30 _Enter")
rs.Command("_ExtrudeCrv Solid=Yes 3 _Enter")

#create contourlines in x-direction and use the pipe command (verticle support)
rs.SelectObject(srf)
rs.Command("Contour 0,0,0 1,0,0 2 _Enter")
rs.Command("Pipe 0.2 _Enter")