Siebenstein-Spiele 5-L Box

I bought this on a recent trip to Paris (from Tumbleweed - recommended highly) and it took enough time to solve that I'm happy with the purchase.

If you search for solutions in Google, they turn up quite quickly - but I only searched after I had independently arrived at this one:

However, #1 son had previously beaten me to it with this one:

which is obviously not what the designer intended but is just as legitimate a solution.  All the pieces move freely, nothing has been jammed in - in fact many of the pieces have a bit of wiggle room - note the gaps at bottom-right and bottom-left.