All is working quite smoothly (WinSPC performs much better than WebDAV), but upon restart though configured to do so, the vault is not mounted though the app is in the tray. Unlocking manually works nice.
Encrypted stuff is in box.com, but the underlying box folder is not there until box-drive loads. Maybe there is a race between box-drive and cryptomator. I would be nice to be able to express the dependency of cryptomator upon loading box-drive, or at least to have a configurable start delay in the app.