Thanks for the reply.
Yeah, I saw on an 'older' SQ2 and the floor could be dropped. We need this ideally for the dog as he's a big lad. But I'm not sure if the B&O Sub gets in the way as I know that is under there if you take that option? At least I think that is what it is.
I'm looking for a boot liner from various boot liner provider sites, I'm guessing SQ2 2016 > will fit then if there have been no shell changes.