Beautiful build. Sean Kelly would approve!
Speaking of Sean Kelly, I forget what CR event / cirque but someone displayed a 979 Kelly tribute bike. Really neat and done right.
As for a saddle, a less known brand was Perache (not pronounced per-ache; rather like pay ock). The company is better known as an automotive interior component supplier to euro OEM's. I had a Perache 027 Super Professionelle on a full French lightweight. For my arse, it was pretty comfortable. I don't remember the specifics but weight was competitive in the weight weenie category of the era. Though I think there was another even lighter, type 017... ??