That's interesting, Joe. I used A CNC for years, screwing the edges to the spoilboard and using tabs. Then I had a different job with no access to CNC for about 8 years. Now I'm back in a position to use a CNC frequently, but decided to try the vacuum system. I made my own plenum from MDF, and built my own vacuum system for probably less than $500, and it is AWESOME! Of course, it does have some limitations, particularly with small parts, but I am really glad I did it. To each his/her own, i guess.....