When the Metropolitan Railway rquired coaches , having fallen out with the GWR, it introduced its own very similar 8 wheel(non bogie) coaches. The first 92 had square topped doors, but after that doors were rund topped.
With modernisation into the 20th century, some of these 8 wheelers were extnsiveky rebuilt into bogie coaches, and most of the rest had minor modifications . However many were sold off , including a batch to a French railway, which actually ran up till 1964, and some to the Isle of Wight Railway. The IOW ones were mainly of the semi modified version, and continued in use up till the 1930s. The Met also retained some for departmental use and some were used on the Brill branch .
This is a complete body and chassis. Some may wish to fit bogies, but alternatively, unflanged wheels could be fitted to the middle pair of axles. It still might be necessary to make the other wheels swiffle a bit.