Below is an expanded and updated set of diagrams I’ve worked on to explain covenant theology in its various dimensions. The earlier version was posted here.
I ended up making three interrelated diagrams so as to avoid things becoming too convoluted. These should be pretty intuitive for the average Reformed office-bearer and the better-educated Reformed believer. (And note, ‘construct covenants’ is a term I’ve coined. If there is a more standard one of which I’m ignorant, by all means let me know.)
West Port Experiment 
This is how I understand the bible also. Thank you for making diagrams of these various covenants which God has made with man in his Revelation; it makes the theology more understandable and from what I know, and I believe I have the Holy Ghost to help me in my understanding, it is true.
Nice diagrams, Michael. Typo in the second diagram: You probably meant “They are more historical” rather than “The are more historical.” These are very well done. — Ben
Ah yes. Thanks for catching that! And I’m happy they seem helpful.