I like your idea. Only thing that strikes me is the size of it all. Generally, scouts travel light and it looks a bit bulky. I'd get rid of the toolbox and find something smaller that'll fit with a more compact design. Plus, it still looks like the top of a toolbox. 
Personally, I think the second photo/idea is better. Looks like it'd be easier to wear but I'd still get a smaller toolbox.
I'm with Ori on the smaller pack idea. If you can find a good view of my back plate. It is supposed to be a built in sensor/com pack relay. Its not large if anything at all. Remember you're a member of a highly advance warrior race. No need for big bulky items to get your job done. You have streamlined compact equipment that does a lot more than the bigger counterparts.
Try to get the point across without making the pack overly large. I say loose the large tool box, if you want to keep the pitcher move it up to meet with the battery container top, and then find something(s) that will fill in the rest of the red area that the battery top and pitcher don't take up. I think you'll have a winner somewhere along those lines.