DIY: Vacuum pump - Make

I am working on a project where I need to create a vacuum. After searching the Internet I found this really nice solution. It most likely isn't as easy as

3+cfm 70+PSI NEW VACUUM PUMP 26+hg compressor/veneer/aerate with Rebuild Kit

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Vacuum pump DIY

How to Make a PVC Hand Pump to Move Water, Compress Air, & Create Vacuum « Hacks, Mods & Circuitry :: Gadget Hacks

DIY: Manual vacuum pump - Make

How to Make Vacuum Pump and Vacuum Chamber