Hey Bruno& Zumba back to the vacuum table.
If you are high production,you do need 15to20hp vacuum like the big boys sucking through MDF or LDF.They gurantee holding one sqft with the rest of the table open.Naturally Zoneing reduces the requirements.As I have a small 15cfm pump I will experiment with it.Perhaps a vacuum storage tank would help.An aircompressor tank is not suitable as it will collapse under vacuum.Really!
Zumba I have not studied the grid table so am dumb on the subject.As a first project for your router could you attatch a solid plastic sheet to the top and rout the slots???Rather than trying to cast the grid.
Larry