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@polybikeuser
I'm absolutely sure that building a frame with track geometry but a downward sloping top tube IS possible, I'm in the process of ordering something very similar myself and Landshark make one;
What you can't do is build it with lugs, has to be fillet brazed or tig welded. You say you want a longer head tube, how much longer? Coz obvioulsy having a downward sloping seat tube is going to reduce the hight of the head tube, this might be where you run into difficulty. Good luck and let us all know how you get on :)