mess around, try to see where those t pieces are most useful.
after enough random something awesome will emerge.
that is how I build.
I can't really help you with anything else. but I'd start with what you think might be the hardest part.
Act first, then think, then try to find a way to cover up the horrible mess you made.
Si Hoc Legere Scis Nimium Eruditionis Habes