This is modified HOOD model of V3S Praga - https://www.cgtrader.com/3d-print-models/hobby-diy/automotive/praga-v3s-1c4c1ad1-4b2c-4dc0-8ff9-e2e09903d65aits just addon, as it has been modified to some details..
you can download it for free, and use it on this model https://www.cgtrader.com/3d-print-models/hobby-diy/automotive/praga-v3s-1c4c1ad1-4b2c-4dc0-8ff9-e2e09903d65a , its 100% compatible
Total length is aprox. 70cm when assembled 1/10 scaleIf needed to scale model, or make some modification or improvement, feel free to send me a message, i will gladly help.