You can take out as much of the interior as you like, HOWEVER before you go Rambo with the sledgehammer stop and consider your options.
I for example found that the interior gables in my 1983 AS 310 turbo diesel were aluminum clad paper core; quite strong and very light. I couldn't replace them with anything lighter or stronger, so I kept them. However like you I hated the MacTac dark walnut fake wood look, so it had to go. I revinyled them and other panels with 3M Di-noc Weave and have absolutely no regrets. It brightens the spaces and gives the illusion of being a brand new space.
http://www.airforums.com/forums/f311...s-97332-4.html
By the way, be careful removing the panels, even the ones you don't want, just in case you do need them for templates or to use them; you never know, plans do change.
Cheers
Tony