I don't have any pictures of mine (A safety 1st) but I basically just stripped everything off of the base, screwed a piece of plywood to it and then screwed a rubbermaid tub to that. I have to load it carefully, putting only very light things in the very front and keeping the real weight over the wheels. I may modify it further and extend the flatbed behind the wheels to distribute the load more. I also think that using coroplast to panel the footwell and leaving a trap door in the deck would make a nice little hidey-hole for bungees or whatever.

Of course, I haven't used it since I got my xtracycle so I may just give it to my neighbor. He's an old retired dude who utility bikes and I know he picks AL cans sometimes when he needs the money. Would probably work great for that just like it is.

edit: Oh yeah, there's a homeless guy who parks his rig in various places downtown that screwed a large dog kennel to his plywood deck and keeps his stuff in there with a padlock on the door. Some modicum of security, I suppose.