This is a cool bike. The neat thing about the nervar crank is that, unlike the other French cranks, it does not require a special puller. It does use an obsolete bcd (128) but in a pinch you can make a 130 bcd chainring work. By and large French BBs and HSs are well made. They also had long production runs so parts are still available (plus there are modern BBs and HSs out there as well). I don't think straddle cables are available for the mafac comp brakes though so you might want to consider using a different brake.
Looking forward to seeing the completed build.
This is a great website with a ton of info on Follis bikes. If you scroll down, you will find a spec sheet with the different models. This bike looks like the 172 both in terms of the braze ons for the brake cable and paint job:
https://anciensveloslyonnais.weebly....el-follis.html
The other upper end Follis models lacked these braze ons.