This is an oldie but a fun and quick one I had done back in 2005 or 2004? It started as a sketch concept for a client that went no ware. So I developed a 3D version of my own concept using track frames and boom geometry from some other previous personal projects. Even though its nothing like the sketch concept, I still did get permission from the client to publicly show my version. Hardly an original idea now but I did have a lot of fun creating it. Its very toy like so hence the toy like colors... The green model is a HAZMAT version I had done for an IVT article.