something like my marin quake. With the RS Lyric Solo Airs, saint m810 brakes (203f/180r), sramXX chainset, X0 gears, goretex outers and my DHX Air. Some nice tubeless wheels from Merlin would be nice too. Chuck on some thomson bars, post and stem and it'd be perfect!
It is a bit burly, but the frames reasonably light and the propedal makes climbing pretty easy.
But, the ideal STW FS? Surely it should be made of steel scaffolding and from really niche manufacturer? I nominate the BMW Race Link! If only it was SS specific…