You have to sit in the glider to know if the cockpit is right for you. Not really something you learn from pictures or videos.
Unsure how you take photos or videos of things that don't exist. Many new gliders are purchased before serial number one is manufactured, every one is custom ordered anyway.
Every glider instrument panel is different. Is that the same for the Ford Focus?
Will Chrysler Corporation let you change a few things here and there in the construction of your new 300? Can you order a different battery system in your Prius? Can you order a new Silverado with interchangeable 6' and 8' beds? Will Subaru let you order white car with beige cloth seats? No cars I've seen can be delivered with the navigation system of your choice.
And if you ask for photographs or drawings of the inside of some parts of your car, will the manufacturer send them along with details on how to do the job you're working on?
I just checked a couple of the glider manufacturers' websites and found some light on imagery, but examples the ASG29 had ample photographs from my perspective and Schempp-Hirth's Wastebook page had videos. The GP14 Velo was documented as you may expect.
Hadn't watched the JS1 Wing Test video in a while. It broke the test rig, good stuff!
Jim