Sorry for delayed response... Been busy.
I have made half a dozen and sold them all.
30cm sq base. 40cm height. I use 18mm seven ply shutterboard available at any hardware store.
Glued and screwed all round except for the tapa which is 3mm 3 ply 40 x 30cm...
Screwed bottom. top and half way up the side *from bottom*
It should have a proper snare but I choose to attach four 0.54 gauge bottom E guitar strings from the top left corner...
(Two strings in and out of four holes a centimetre apart, hanging about 6cm down inside the tapa)
I also fitted a cushioned seat to two of them.
Four door stoppers for rubber feet.
Varnished all round.
On one of them I fitted a drummers base kick pedal and stole Milo's tennis ball for a nice soft thud.
Hole *about the size of a cd* one third of the way up the back... a mic a few inches from hole works well ?