Lookin’ good! You are sure getting your quads down pat.
Great side by side comparison. The first one was impressive to begin with, and second even better.
Weekly progress:
Rear hood extended with tunnels for the gearbox cooling
Front and rear Stabiliser
Seatbelt
Brake callipers redesign
Render made with not subdivided model.
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Lovely work!
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This is awesome use of SU. Feel free to share here: Redirecting...
That looks fantastic!
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through
One year work on the model 
Fittings details added
Door hinges plus pipe frame for stability of the doors
Electric systems: ignition coils, battery, control box, transitor ignition boxes
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impressive as always!
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Are you going to 3D print a model at some point?
Such impressive work!
If you are ever on Facebook, feel free to share with us in the Trimble SketchUp Group. This would definitely raise some eyebrows.
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Wow, those exhausts are a work of art!!
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Engine subd test
Engine - more details added according reference pictures
Exhaust pipes re-positioned
Oil pipes for the camshaft drive added - needs some rework to look more realistic
Rubber clutch added on the fan
Current build status
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The details you are adding are fantastic. This is similar to the type of mechanical modeling that I do with SketchUp, so I love it! 
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I have only reference pictures - that makes it not so easy to find the right dimensions. It’s the 4th version of the engine design - after i got a large set of pictures of a restored engine.
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Simply stunning! If you don’t mind my asking , how big is the file and how many hours do you think you have in the model so far?
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Indeed, this can be very challenging. For my project (Viking '75 Mars lander) I have been fortunate enough to have personally captured over 1000 detail measurements from actual hardware, I have found some published measurements, plus eight years ago I purchased a nice set of blueprints with dimensions that cover important areas. Even with all of that, I think I spend more time in Photoshop trying to work out “intermediate” measurements from my 3500 detail photographs of the hardware than I do in SketchUp actually working on geometry. My overall subject needs tens of thousands of detail measurements; your subject probably does also. Imagine the shop drawings used to fabricate your car’s engine block. It would probably have hundreds of measurements just there. We have chosen complicated subjects, I guess.
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