Just a few thoughts. By adding the shower and what I presume is a bunk bed, you have reduced the available wall space for windows and ventilation considerably.
There is now a more pronounced front bevel that eats up shoulder space while seated and forces the bunk to extend a bit more into space above the dinette. I presume that most of the frontal area of the trailer will be in the slipstream of the tow vehicle, so a smaller, less pronounced bevel at the top like your original sketch might be worth reconsidering.
It's a personal preference, of course, but in small spaces I like to minimize the number of upper cabinets and full height partitions in order to open up the space and sight lines. Depending upon the intended use of your trailer, the amount of time you will be on the road, and the amount of stuff you must carry, I would think hard about minimizing the number of storage spaces, again with the idea of eliminating overheads. From experience in both our large Airstream and the much smaller VW Westfalia Camper, I have found that there is more than enough space for everything we need to carry for at least a week in the VW and a month or two or three in the Airstream.
In thinking thru my own design ideas, I like to create scenarios and to see how they would be implemented with the equipment and facilities. It helps in making sure that things are not forgotten and are placed in the best locations.
I look forward to seeing the next iteration. Fun stuff.
Have a kitchen to redo before I can even think about building a trailer...