My wife's family owns some property in Alabama. On the property are the ruins of an antebellum home. Behind the ruins, almost hidden in a stand of trees, we found a privy. After hacking away at vines and shrubs, we were able to swing open the door and discovered the privy had seven holes arranged in a semi-circle across the back wall. That's seven as in seven.
(Does a family that goes to the bathroom together stay together?)
So this is my idea for your course. You set up something less ambitious, say just a four hole privy. No plumbing, just a pit underneath. Think of the advantages. First, it will speed play. Everyone in your foursome can get relief simultaneously. No waiting. Second, it will foster a new sense of togetherness among members of your club. Third, it will be inexpensive to build. Fourth, you clean out the pit periodically, fertilize your course with it and, chizzam, the new privy has paid for itself after a couple of months.
Bob