Almost ready to get started
I agree with the previous post that sheeting would be better.
Make some cardstock patterns of the pieces.
You can glue two pieces together to get thickness, but for length, there needs to be a brace across the joint. otherwise it will be too weak.
Take a look at this site. It has simple plans which may give you some ideas of how to do this
http://eezebilt.tk/plans.html
Good Luck