Is it possible...yes.
Is it advisable...no.
To get pages to open in the same area as the pond picture on the main page would require an iframe. It would make navigation more confusing as people would not normally expect something like that. It can also be a moderately advanced task to get things to work cleanly.
My impression of your experience level is that something like that could be really difficult. You would need to spend some time reading, experimenting and learning to get to the level you need to do this. If you are willing to put in the effort, it can be done. I wouldn't recommend doing it that way as it will usually cause more problems that it is worth. Since this is a club site and you are not necessarily looking to attract a lot of visitors from the search engines, you have a lot of freedom in what you can do with it.
I suspect this answer doesn't help that much other than to give you a clue of what it will take for you to do it.
I love the models and would kill to be near you guys. Unfortunately, it appears I'm on the other side of the Big Pond from you
Good Luck