Hi, I now have the Mobiframe floor, 4 rail version, and 150cm seat.
As supplied and fitted, the edges are unfinished with the floor covering slightly larger than the floor to allow it to be trimmed to a more precise fit if required. I have actually left mine untrimmed so lapping up some of the walls.
I have found that the Caravelle step threshold fits nicely with the floor, but is a slightly different shape at the sides - there is a few mm gap but hardly noticeable and I'm not attempting to do anything about it yet. A bigger issue ids the rear threshold. The Caravelle rear one fits after some trimming, but I have barn doors and the Caravell doesn't, so there is a bit of work to do. The door shape is different too and I don't think there is sufficient clearance to fit the top cover part of the Caravelle threshold, so I may carpet the bottom section instead which will also allow me the fill the 50mm or so gap at each end of the threshold as it doesn't go full width. The alternative at the back is to fit an aluminium angle to the raised edge.
The sliding mechanism seems good and smooth so far, not tested it out much and not slept on the bed yet. There are a few rattles but they are reducing as I check tightness or make adjustments.
I asked how people attach a kitchen, knowing how mine was attached to the floor when I was removing it. I was advised that it was not recommended to screw into the floor, so I don't know how it should be secured. That is not an issue for me though, I've gone to a full width seat and will be fixing a removable small kitchen pod in front of it when camping, clamped into the offside floor rail.