Old catalogues, measurements of flatbed and other things

Almost all of the rolling stock for Thomas the Tank Engine and Friends in the early years came from Tenmille kits (some built to spec, some modified - Annie and Clarabel and the three similar coaches are Tenmille Stroudley 4-wheel coaches with alternate roofs, the large coaches in the first season are kitbashed "shortie" versions of Tenmille's SR Maunsell coaches running on AG115 bogies, the SR CCTs used were mounted on the same instead of being 2-axle). It's all quite memorable, and gives me some specific things I want to duplicate in OO scale for my own Thomas modelling.

Of course, to do that one needs references and measurements. Screenshots of the show provide a wealth of visual references, of course, but for some things catalogue photos from the time period would help. Also measurements of the models, if possible.

There are some particular models I'm aiming for and don't have all the data I need yet:
* One piece of goods stock that stood out to me is a four-wheel flatbed, with short sidewalls and two pairs of stakes mounted to them at either end. It can be seen in the big station yard in several first-season episodes, Edward's station in another, and was actively used in "The Flying Kipper" where it was placed as a barrier wagon between the brakevan and the last fish van of the titular train. I would like to duplicate this, but I need the length.
* There's also the Maunsell coaches. I have the measurements of the width and the height, but again I'm missing the length. I would crosspost about this in the Prototype Information thread but I don't know which particular Maunsell coaches Tenmille based theirs on so I'd probably just get told off for being vague.
* I could also use the measurements of Tenmille's Cowans-Sheldon 30-ton breakdown crane, as many as possible. I'm at least assuming those were Tenmille kits like most of the stock. This one I will be crossposting about in the Prototype Information section.