On close analysis, I can see that all your parts are there, and appear to be hooked up properly. So something is gumming up the works, or something else is responsible for your problem.
I know that those diaphragms do fail. I forget exactly when that comes into play, but it should be able to hold vacuum for a couple minutes or so. If you have a hand vacuum pump, you can test it.
Hopefully you don't spend your whole day dealing with this (unless you really want to!

)
Happy Thanksgiving!
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1972 Chevy C-10, SWB, Fleet, 350/350, PS, PB, HEI, mostly stock, Survivor.