Check these out. Pretty much evrything you need and need to know including making your own system cheap!
http://www.joewoodworker.com/veneering/downloads.htm
http://www.veneersupplies.com/pages/...um__Press.html
Be sure to look around at the other various pages available on these two sites. A lot of information, materials and plans for building your own vacuuming pump/press systems.