Ok, stay with me for a minute; we have enjoyed using the dinette area without the table as a area to lounge and read or just hang out, without the table in place. I've taken the table outside and leaned it against the side of the scamp
when we do this and the feeling of much larger space is nice.
I propose to retain the ability to remove the table from the dinette but retain the functionality of the original table and mount points with the following idea. We need to replace our dinette table because it's absorbed some moisture and the laminate is coming apart as the particle board swells.
I would replace the original dinette table with 5/8" plywood (maybe 3/4" or whatever dimension fits the slot to match the original thickness table) and use the original mounting column for use during the day.
At night, remove the column and end turn the table top to expose the end normally against the rear wall under the window to show this bracket
. Attach half that bracket to the dinette table and the other half to another piece of plywood 24" X 34" for the bed extension. (You may have to provide some additional support under the bracket for the bed extension to attach.)
Support this new bed extension with a four legged table base in the isle built from 2" schedule 40 PVC pipe, built to size that is approximately 12" W X 12" L X 19" H, placed near the end of the bed extension away from the dinette table. This four legged table support can be stored in the shower closet during the day and used as a trash receptacle employing a "tall kitchen trash bag" and deployed at night under the bed extension. (The legs of the support table could remain removable, if desired, to allow you to store flat if you didn't want to use it as a trash receptacle.) I suppose that you could actually build the support table much larger to provide support to the extension and just knock it down during the table for a more secure base: 18" W X 24" L X 19" H
This new idea is much less expensive. Also, a lot lighter weight and easier to manufacture as well as easier for anyone to deploy/store away.
To answer your previous question: the isle way is about 30" wide. I used 24" wide in my original design simply because I already had a piece of plywood that size.