Progress-update.
About that 20T bevel gear: yes, this added some resistance. It didn't really slip, the chain slipped before anything else. Anyway, I changed the gears in the following way:
Furthermore good progress. I need to order the wheels and a panel, but hopefully the following pictures really shows what I have in mind.
Now, the cabin is added with HOG steering and a handle to tilt the boom/forks. De handle locks in this position.
On the other side I added some panels, but this needs some refinement. Also the gear to lift/lower the forks as a modern interpretation of the big wheel used in the original model.
The back of the model.
Let me know what you think about this! Suggestions and tips are welcome.