Creating a 3D Toy in Max

This is a simple 3D toy which I have created using 3D Studio Max. To create it, I have used skills such as Bevel, Extrude, Weld and Attach. I have created a number of different shapes - including squares, cylinders, cones and circles, and then extruded parts to extend them, welded parts together to tidy everything up, and attached each of the shapes together to make it complete. In this Render, it doesn't look quite as good as my model, as there is a cone which goes between the head and the body - it doesn't show up in the render, though.

I got the idea to create this, as I used to play with 'wind-up' toys a lot when I was little: an example of which is found in this next image. I found them very entertaining.

With this 3D Model, I wanted to create a wind-up toy which would move (thanks to the wheel at the front). However, this would take a great deal more work before it is complete and 'useable'. As it is, the wheel wouldn't move, for instance, because the body resting on it is too 'square'. It would just drag along the floor if it worked at all. To make it more realistic, I would have to remove any part that could impede on movement, and would also probably need a second wheel at the back to help support the model. Also, I would want to make the 'wind' look more like the ones I used to use, rather than having it a simple square.
Considering this has taken me a few hours and it is still very basic, I would imagine it could take days or possibly even weeks to come up with a finished, final, professional model for a toy of this style.

If I have more time on this, I would like to round off the model and make it a little bit more realistic in terms of usability - remove the barriers stopping it from potentially moving and just tidy the whole model up.