I made a giant cyclone for my machine and it worked well when I came to machine some foam. I would say with the sheer volume of dust you are going to produce you will def need a cyclone as a filter based system is going to clog up fast.

Have you seen theses

http://www.ebay.co.uk/itm/Omni-Dust-...item27eec01dd7

Might be too small for your application? Worth a try