Hi Dave,
Yes, Avelings did have their own foundry. There is a nice picture of it here:
https://apps.medway.gov.uk/apps/medwayimages/details.asp?pga=21&searchtype=all&search=aveling&pg=4In this image they would seem to be casting rear axle brakes. They are pretty large.
In the images I posted in image 1 you can see the rivets being squeezed by a large horseshoe shaped rivet squeezer hung over the firebox of a boiler. This was a much quieter process than hitting the rivets up with hammers which was terribly noisy. Some would still be done with guns but pretty limited. In the drop forge shop in the image below I cannot see anything I recognise.
In the second uploaded file I can see in the machine shop, gears and rear axle boxes. I recognise these from my engine. They are laying on the floor and about 8inches wide by 15 inches long with a hole in for the axle, with a Bronze bearing pushed in. The star shaped item is a rear wheel centre what would be bolted or rivetted to a back wheel.
The final upload of the stores is interesting in what it shows. There is a final drive gear leaning against the racks. Also more axle boxes and gears and brake drums.
There guys working in the stores must have been strong as some of that stuff is unliftable for me. I can see only one pole crane at the far end of the stores.
DTT