[Aren Siekmeier]

Excellent start!

Essentially what Joe is getting at is to continue adding detail. You will find that the biggest benefit of CAD is having everything planned out before hand so that when construction rolls around there are no questions and it just flies together. You can make sure everything fits exactly how you need it to before cutting anything. So you're off to a great start, just make sure to pay attention to all the detail. Since this is just practice it's not as crucial but when build season rolls around it will be.

One suggestion: I assume you are using dead axles, given the bearing blocks you have chosen. In that case, you might want to consider putting the wheel axles straight through the lower frame rails. This will give you some freedom in the vertical direction to get a drop on the center wheel, which you will need if you want to turn, and cuts out extra components.