If I just wanted to kill a shed load of people,
I'd buy a big 4x4 second hand, take it to a busy shopping street, and mount the pavement.
( Moon Girl Technologies don't take my word for anything, Wed 9 Jan 2013, 17:24, Reply)

I'd start by buying a shed.

( Dawn Of The Bread $$$$$$$$ E-THUG 4 LIFE $$$$$$$$, Wed 9 Jan 2013, 18:00, Reply)