re: Pre-Prep

Ty - I made the vacuum pump from an old compact refrigerator compressor.  Google it and you'll find a lot of info.  I  incorporated a vacuum controller that shuts-off the compressor when it reaches a certain vacuum level and turns it back down once the vacuum leaks down some.  There's some hysteresis involved, so it doesn't cycle constantly.  There are free detailed plans for a few different styles of vacuum pumps here:  https://www.veneersupplies.com/pages/DIY__Vacuum__Press.html

Duck - Thanks.  The makeshift bags are pretty tough.  I've been using some smaller tube-style bladders for years.