Some steps could be omitted or changed. I bet you wouldn't even need benzene. And acetic anhydride can be made from acetates (that you make from glacial acetic acid) with a simple distillation rig and some other glassware. I'm just saying, if you have the stuff and the ambition, it might be something of interest.
Maybe my scientist buddy SWIM will try it and tell you guys how it is.

Thanks to roguesci.org he knows alot about home chemistry .