First, ask yourself "do I actually NEED a MEMBRANE keypad or can I get away with another more intuitive solution?".
Here's an example picture of 3 Buttons, LED, IR Receiver plus LCD done as a prototype 'on the cheap'. It looks like a membrane but it isn't. It's actually all standard PCB mounted with the LED and Buttons mounted on the reverse side of the thru-hole-plated PCB.
If it's prototyping or a small production run, then membrane is not the way to go unless you've got a budget (preferably with someone elses money). Once you're sure, then you can go that route, but once you've discovered how inexpensively you can make things using standard PCB's (eg in bulk the switches are like UK 3.5p/US 7 cents each!!!) you may not want the membrane route. Really, that's only a mass-production consideration.
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