ASU-85 self-propelled gun (Russia)

The ASU-85 was an airborne SP gun of the early Cold War era. It makes an interesting, if surprisingly large, model, in 1:76 scale.
This model was based on a rather sketchy (sorry!) design in the SketchUp Warehouse, provided by Andrew M (in Cyrillic...), to whom my thanks. The suspension was very rough, so I have replaced this completely with one based on my earlier 2S1 offering (I have learnt a lot doing this!), and strengthened and simplified the model as best I can.
The model is split into