I stumbled across this thread from last July mentioning part of the Piz Gloria viewing platform was closed, and part of the Birg thrill walk as well.
Has anyone been more recently that can share an update?
https://community.ricksteves.com/travel-forum/switzerland/schilthorn-construction#bottom
A section at Schilthorn is closed off and the Birg Thrill Walk is closed at times when they are blasting in the area, but it can change down there day by day so you’d have to ask if that part is open once you’re getting ready to buy your ticket. Between the 2 stops you’ll get a 360 degree view, so it’s really not a big deal.
You can see the construction schedule here:
https://schilthornbahn20xx.ch/en/Info/Planning_Schedule
Scroll down to timeline for more detail.
