Welcome aboard Topbilling....If you have decided on building your own, and we all hope you do, it's an incredibly rewarding project. Think about how you camp, what is important to you and what you can do without. And also think about how many people will come up to you when it's all said and done and say..."you built this?" cuz they will! People giving you thumbs up when you go on a trip and at a gas station makes it worth while.
You will find just about all the answers to your needs here, but it's important to build what you want. If it takes cardboard mockups, chalk lines on the garage floor, models etc...just do it. Most importantly, use your imagination. There are no hard and fast rules. Hope to see you down the road! Beware....it can be addicting. I've built 4....

got 1 on paper, sort of. Doug