I used ultralite mdf for my whole cabinet EXCEPT the top of my control panel. (5/8" PLYWOOD)
What is "ultralite mdf" I've never heard of a lighter weight MDF. Is this available at the normal big box lumber yards like home depot? Its not the stuff that looks more like sawdust than cardboard is it?
we use crown molding made of the Ultralight MDF at work, it's the same consistancy (very fine fiber mixed with glue/resin/whatever-it-is) so it's not like OSB or particle board if that was what you were wondering....
very nice, sharp, smooth cuts..great smooth paint surface..just like working with regular MDF molding, but it weighs ALOT less..probably half the weight... not sure about screw holding ability, or the strength of the flat stock though..never had an opportunity to work with sheets of it yet..