The most affordable option is the "Black Box" vacuum system. Basically it's 4 home vacuums plumbed together. I have one with 2 on a 4x8 table and I'm just waiting for the next project to upgrade to 4. You can buy one ready to go on the net or build your own. It's not rocket science. Also runs on 220v (30A). This is a very proven option but please understand it is not for heavy commercial use. The next step up is a vacuum pump. These will be more expensive but they're built to run all the time. The biggest "issue" with these is the 3 phase power. Some buildings don't have it and if you do, it can be expensive wiring for it.
As for the table. MDO or plywood base. .75" or 1" Medex or similar cabinet grade MDF plenum. Surface and cut your grid into it. Seal with several coats of poly. Also I made this mistake, but you want to split your zones up using strips in between. Glue the spoil board down to plenum. Spoil board should be made of Trupan/LDF. Whether you need to skin both sides of the LDF is up for discussion. Some say just skin one side. Others say do both.
Just so you know, you really can't cut Coroplast with a router bit. You'll need a drag knife. Also don't expect the vac table to work for everything. Full sheets is where you're going to love the vac table. Cutting out of scrap pieces, I'd expect to throw a screw or 3 in the material.
