There is some useful stuff in the set. Mt Bibbly and Skrapwelder have both used the 'dustbin on legs' to good effect and Skrapwelder has used the tracked 'self propelled gun' too. I have projects planned for both of these. The steam monowheel also begs to have a Victorian rider fitted. The other two items will also find their way into my projects.
As is, the 'seat' looks more 15mm to me, but as I stated in the thread linked above, worked VERY well in 28mm with a bit of fiddling by my chum.
Too well for a couple of opponents the time I got to run it with it's electro-cannon mod...

Doug