That honeycomb stuff looks interesting, ty for the link.

With regards using plate for the bed, is there any advantage in bolting say 20x80 or 40x120 profile to either the top or bottom of the plate? Full cover or just certain strategic locations?

Also this stuff as a bed plate surface? http://stores.ebay.co.uk/Vakuumtisch...=p4634.c0.m322 , certainly not cheap but very convenient.

The basic question is, just how much benefit does one gain when increasing thickness by bolting two plates etc together?