My idea for the canon is that SCP-2399 has completed its repairs and is engulfing Jupiter to turn the planet itself into a super weapon. This, of course, means that the Great Red Spot has disappeared from Jupiter. Meanwhile, the Department of Extraterrestrial Affairs does their best to negotiate with the beings which operate SCP-2399. The twist? Jupiter is a distraction; they're building another massive mechanical structure underground on Earth.
Does this sound interesting? Do you see any immediate troubles with the initiation/implementation of this canon/series?
(I use canon/series because I do not know if it has enough content to be a full canon.)