Boy, I'd like to redesign all that stuff with today's technology. All transmissions would be digital. The suits, LRV, LM, CSM and earth station would all form a mesh network. All suit telemetry would be moved out of the voice band onto its own channels. Each microphone (2 per astronaut) would be given its own dedicated channel so that there would never be any ambiguity as to who was speaking, and the microphone giving the best voice quality would automatically be selected. The headphones would be stereo so each astronaut could place the other parties (Capcom, the other astronauts) at different points in the stereo image to make them easier to distinguish. And so on...
I like the idea of building the suits right into the airlock door, so you climb into them from inside the cabin, seal up the back, and then detach yourself from the outside of the cabin. All the dirty surfaces of the suits remain outside.