Cutting logs

Simple but efficient.  

I've seen something like this before, built out of fence posts and portable.  The problem I have is that my chainsaw blade is only 350mm, so a freestanding one would have a narrow base and may not be too stable.  I could fit stabilisers, but I'm not intending to cut too many logs from trees, so an ad-hoc one like this does just fine.
About a stere an hour can be cut.  If they are small diameter they go straight into the trailer and onto the woodstore.  If not, splitting adds a little more time.
Maybe I need a bigger chainsaw...