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Yes, I have the SWB van. The brackets for the front of the seat assy appear to be welded on the higher section of the floor (not under your black plate).   Ignore the wires in the photo. They are for aftermarket heated seats.

If anyone is interested in checking out my rebuild I have been posting it on youtube. My floor and bed is complete and I am very happy with it so far. Right now, I am currently trying to figure out where to put 3, 7 gallon Reliance jugs of water in respect to a pantry cabinet that I want to build on the passenger side. This cabinet will also hold my new Bluetti Elite 200 power station, Charger 1, and home made Manual Transfer switch for Alternator/solar selection via switch. Charger 1 is on back order so I am waiting for that to come in before I find a final home for them inside the van.     I gutted it all here recently and started over with a completely different sofa/bed design. I posted all of my progress on youtube if anyone is interested in following here are the clips:  Part 1:  https://youtu.be/3rWeurxQfko?si=OjvrCZym-RL-IVQu Part 2: https://youtu.be/mWkbFnAC9jQ?si=1y2COW6G2657GI6k Part 3: https://youtu.be/eZwaCd6qCI8?si=4x6hCqG8sjZ_dObS   Part 4: https://youtu.be/PpdG5DLg-UE?si=5_6MdK0I_V3FlpLI Part 5: https://youtu.be/K34VZaOwj6k?si=6QJzTtL_mVsh96Bz   About 7 years ago this was the thread with my original design that I recently scrapped:             

don:  great pics thanks! can you take a few  pics of the rear mount part of under seat that snaps or hooks into the van floor rear seat mount?  cannot see what it looks like so i can find the right part .  thanks!

was this the short wheelbase cargo van  (104 inches) or the long wheelbase cargo van (120 inches)    i cant see how the middle seat will fit into the SWB cargo van          

I didn't on this van but did use it “Gaps and Cracks” to glue in some polyisocyanurate panels where the walls were flat enough like the rear window spaces. I've done it before on a previous van and if you do BE VERY CAREFUL not to fill the space as the foams expands with force and will deform the outside skin of the van.  I’d stuff them with a hydrophobic fiber like glass fiber, or thinsulate if you are rich.

You're replying to my question about what year/model. My van is a 2015 Cargo, similar to your 2018.   See the link below for a discussion about sound proofing. Also consider adding in a storage hatch in the foot well area if that's not on your mod list. It's great having the extra place to stash things. There are multiple threads discussing this mod besides the one below. Good luck!    

Physical fitment might be the easy part.  Getting everything to plug in and work will be a lot harder.  Maybe not even possible.

Has anybody filled the voids , like columns, empty wall panels with expanding foam for insulation and noise reduction?