I am playing with the idea of building a lugged track frame for myself. I am trying to think of some ideas that would make the bike kind of unique and I was wondering if it would be possible to do a "seat mast" like the Giant TRC Advance with a lugged frame. Something where the seat tube would go all the way though the seat lug and serve as a seat mast. I would cap it off with something like this sleeve (on the bottom right), which would leave a lot of room for some creative filing. I think it would look pretty damn sweet. Can it be done? Has it been done with lugged steel?
Giant TRC for reference.