I don’t know the information you are looking for, but I have had driveshafts made and even modified before. It was not as expensive as you would think. First you need to pick a drive shaft shop and talk to the about what you want to do. They have all the answers. Most shops of this type do truck drive shafts as most cars are front wheel drive and do not use drive shafts. Shops that make leaf springs will know where good drive shaft shops are and you can reference them as well in your search.