RC
While there are still a few more days to the off season, I placed a part and drawing of a weldment frame for you to take a look at
http://blogs.solidworks.com/teacher/...nts-for-b.html
There is also a movie file of a buggy that shows the complete technique with 3D sketching.
Weldments are not automatically displayed in SolidWorks, you must right click in the Command Manager and check the Weldment toolbar option.
The weldment technique is to sketch the frame in 2 d or 3 d and then select the cross sectional profile. My guess is alum. tubing will be used. You can modify the dimensions of the cross section for your framing by editing the sketch.
Once your frame is complete, you can then place it in a drawing and ask for the cut list. This modeling technique is alot faster than trying to create a welded frame or tubular frame as an assembly.
Let me know if you have questions. Marie