Vectors, Normals?

do-dec = 2-10 i.e. a 12 sided polyhedron (this has pentagonal faces)

http://mathworld.wolfram.com/Dodecahedron.html

You are referring to an icosahedron (triangular faces)

http://mathworld.wolfram.com/Icosahedron.html

... as to the aligning/attaching problem - can't help atm... I'm sure someone will be along soon who knows this stuff.