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@hilarystone
Seat tube length is not very important as long as you can get the saddle low enough for your normal saddle height. With lo pros the top tubes slopes down (and there's often an extended seat tube) so standover clearance is less likely to be a problem. But Top tube length is important. If you're using proper aero bars (either cow horns or the Tri type) TT length will need to be a little shorter than on your standard road bike ... if you're using flats you will probably need a riser stem and TT length can be longer but it all really boils down to where you like your bars. Best advice is to measure your current set up - saddle-bar length, saddle-bar height and see if you replicate it on the frame you fancy.