I had no master plan, I just designed as I went. I also wasted quite a bit of time on parts that I ended up not using. The first mistake was trying to adapt a vertical lawn mower engine to horizontal (don’t waste your time).
A few major components and links:
Warning: Welding can be dangerous. I recommend taking a class if you do not know how.
Step 1: The Start
My brother has a Polaris Ranger that I got most of the dimensions from. I first determined the wheel base and extended my frame to match ( more or less).
The next part of this project I bought 1 1/4” square tubing to create a frame for the seat and floorboards.
Next I had to extend the width of the original ATV so I cut off the shock mounts about 4” from the shock. I fabricated an extension plate to match the u-shape of the shock mount then welded both top and bottom of the seam to really reinforce this high stress area. With 1” square tubing I built out the frame and welded on bolt tabs for the swing arms.