Saw this on tinternet and thought can't be that hard. Baccy tin with a fax machine speaker hot-glued to the bottom (the fax machine's unfortunate demise was one Monday morning when it refused to take the paper for the tenth time!!), soldered to a mono jack socket which was drilled and mounted in the side of the tin. Critical part is to stick a heavyish metal disc to the shiny dome thing in the middle of the speaker. this one is about 35mm. I reckon a smaller one would give a higher sound like a tom tom.
Well it works ok, lid down and tap it with foot, sounds a bit like a kick drum. Probably would sound great through a PA . I am going to attach it to a plank so I can boot it properly.