I'm quite interested in an articulated hauler body parts model too. I'm thinking of doing one as my next project.
But this model looks a bit small. If the length of the model is 40 cm, then at 1:10 scale, the original would be 40*10 = 400cm = 4m. I don't think an articulated hauler with that appearance could be as short as 4m. The smallest CAT, the CAT 725C2, has a length of close to 11m.
So maybe a scale of 1:20 or 1:25 is more accurate for this model?
I also found this, which looks like the same one, but this one is listed as 1:28 scale.
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https://cnjhtoys.en.alibaba.com/prod..._For_Sale.html
Stein :-)