If you look at the cost and time to buy the necessary tools, parts, and learn how to do it, and do it safely, you would have saved yourself a lot simply by buying a standard product.
First learn what it is, Then learn which type you wt, only then you might think of making one...
If you knoew enough about what you want, your question would be much more detailed
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc