Looks pretty good. One thing to note thought is if that fence is not vinyl, then it is going to rot out really quick with all that dirt and sand piled on it.
Second, you never ask for permission from your wife. Once you do you have lost all power and will never be able to do what you want without approval. Repeat after me,"I am going to build a really cool rock crawler course in the back yard. It is going to be a lot of fun for me and make me happy."
Remember two principles. "I am going to do ......" & "It will make me happy." Then to bring her into the process you ask if she has a specific area she would prefer you build it. Now you let her be part of the decision making process without giving up your power to make decisions for yourself. This does not mean you are going act like chauvinistic man, just one who can make decisions. Trust me (I've been married 15 years with three kids), women like a strong decisive man. Chances are it will make you more attractive to her as well."thumbsup"
The above is the way to do it. Below is a servery wrong way to run a marriage. You are the man, be one, or she will loose all respect for you!"thumbsup" ------>