Hi Lynda,
Here is a link to the construction of a small landyacht that would ideal for students to build in metal working classes.
Using common materials that are easy to obtain
The designer (Paul Day or Landyacht on ths forum) is a great guy and would be more than happy to assist in any way you might need.
I have given you a direct link to the construction details as wading through the forum might be a bit daunting.
But jump on the land yacht forum i'm sure we can help you.
www.seabreeze.com.au/forums/topic.asp?TOPIC_ID=33825