Ok, your base and top want to be same.
You want your 2/4 so the vertical face is the 4" side.
Your want you long 5ft bit to be one continous piece. and the 2ft sides to one piece.
Your upright will butt-up to the base and top.
You want every piece of 2/4 used in the lid and base to be sitting on top a 2/4 upright, so that all the weight is on the 2/4 upright not the joins in the top.
Stick it all together how ever, glue and screw it. (i wouldn't use nails)
then make like a top for the top of the frame fom like 18mm marine ply, glue and screw to your 2/4 frame.
you should probably screw and glue some sheets of wood to the sides and back, going into all the uprights. this will stop it racking, and keep it all square ect.
http://img219.imageshack.us/img219/3605/dsc00232on9.jpg
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Bill.
sorry forgot to click the buttom that shrinks it.
doesn't the site shink them to 800/600 anyway? or is it just my pc? :-?
When I posted it, it looked 800/600