Unless you're going to spin up a production line for receiving frequent orders for these parts and possibly others, then I suggest that the kickstarter model is just too complicated and the wrong way to go.

If all you need are the funds to cover your time and materials plus margin and a beer or two, then you might consider taking money up front from customers, one part or kit at a time (e.g. side skids - currently the most in demand, then rear skids, then front skids, etc. based on demand).

The end results are the same and a lot less complicated than involving a third party. You get the money up front, and your buyers get the goods when you make them.

??
-V