here are the plans for a more heavy duty carry all. the main notes are that you will need to use your judgement and remember all measurements are inside ones due to the fact people use different size wood. I think I used 1/4 and it was still really sturdy (and heavy after loaded up, but I think that is normal). I.E. that you will need to add in the zie of wood used if there is a wall on the inside.

[link=http://www.cksmith.net/downloads/prototype.jpg]Fieldbox[/link]

I have also uploaded them here if you want them.