is it possible to remove all attachments from before the last upload session, except for the own design, AU en parts sheets forums?
No. I'm pretty confident that I can only prune all attachements at once but nothing beyond that precission. And even for that I am not 100% but I don't want to start testing it before you guys have had change to backup stuf
Is it possible to disable attachments on certain subforums?
Nope
Perhaps restrict it to real design, never builds and maybe parts?
a good idea, but not possible to assing the attachements to be allowed in certain forums. Only PMs can be ommited not to have attachements
Just another thought: Maybe attachments should be a privilege of Premium members, Elite members, and staff?
This however could be done. The proplem is that I think most of the stuff gets uploaded via attachements by the ones who draw most...and them who draw most usually are in the premium end of the members