Model identification

[Dolnikan]

Hey! I've been going through some of the things I got when I took over the remnants of a collection some time ago and there I also found a ziplock bag with these contents. I think that it's some sort of siege weapon but I have no idea what it is. Has anyone, by any chance, ever seen this before?

[Iain R]

One of these things is not like the other....

The T shaped piece with the saddle is part of an old Warhammer 40k Imperial Guard heavy weapons carriage (heavy bolter or autocannon), and unrelated to the rest.

The rest might be components from the 5th Edition Warhammer Fantasy Seige Defenders set.