Something reminded me of Jeremy's cart:
original thread
So I'm imagining a child of this, a wheel barrow and a sawbuck. Somewhere to put tools, a wood support when cutting, and (why not) ability to take the cut wood away once the job is done.
It could be a frame that drops in a standard wheelbarrow perhaps, so it is a plain barrow when the extra function is not needed, or something that folds out of the way....
I think we may have some naked barrow chassis somewhere, maybe I could make something up.