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@jdmitch
yes and no... the stays are aluminium, but the existing dropouts are* steel, so I am planning to drill and 2 holes through each dropout (there is already one on one side for the derailleur hanger), and bolt the track ends onto that. Then, I will trim off the down bits of the dropouts, and part of the track ends that would normally be welded to the stays. Not planning to do any welding, though I may fill in with a bit of brazing (lower temps) for extra security if I am feeling nervous.
Eventually, I will make it the transitions all smooth and "aero" at the same time that I am doing the gussets/webbing... @HHC - planning to do a little curved triangle-y thing following the curve of the wheel between the seat tube, stays and brake bridge (which will obvs be superfluous ;) I am also planning to do a foam-based gusset between the seat tube and top tube, as the tubes are both rounded at that intersection.
The downtube comes to a sharp-ish edge along the top, so I will probably use the more standard approach (like @monoglaze ) of flat aluminium plus bonding. However I was thinking maybe I could get away with not actually using aluminium, but some sort of plastick-y card (thinking of something like those thin self-healing chopping boards).
I will try to illustrate the intended changes once I can get to photochop on my wife's computer.
Still not decided about what to do around the seat cluster area though, as I imagine it will look strange having that little "tail" (end of top tube extends past the seat tube). Any thoughts?