Now looking back at the donor carriages, do you see what I can see?
Here are pictures of both sides to show you what I mean.

- 20250830_070724.jpg (10.56 KiB) Viewed 373 times

- 20250830_070516.jpg (12.25 KiB) Viewed 373 times
As can be seen, one side has doors and the other does not.
Now I could make doors on both sides and build them as nice bogie coaches, but the roofline makes them just a tad too narrow in this form. Yes, one can widen them but one is making a lot more work for oneself. To make them into bogie coaches with doors on both sides is enough of a job in itself. To make shorter 4 wheel coaches is actually easier from what I can see.
But anyway... As can be seen in the photos above, if I cut right down the middle and cut the roof off ready to join again later, on the door side of the carriage I can make two three windowed sides, and on the non-door side, I can actually make two four window sides (Look at the photographs above to see what I mean).
Now I can either re-arrange the window positioning to make a 4 window coach with a door at either end, or I can leave the positioning as it is, and make a passenger brake coach perhaps using spare Peco dockets in the smallest of the smaller windows at the end? It looks made for it! I can also see if I can align the square opening hatch on the roof to align with the brake coach if that will work out... We shall see. Lots of possibilities both in the form of model locomotives along with carriages making these toys well worth the money compared with buying the usual kits as well as being a whole lot cheaper than if such a coach was available in ready made form.