I've cut out all the pieces with the circular saw. Not as confident as I would be with the mitre saw, but the lengths mean that's not an option. Another tick for getting a table saw in the future.
Still, it wasn't too bad, a little trimming required but I'm pretty happy with the results.
Now, you'd be wondering, what do you want to use a router for on this?
Well, I'll tell you. I decided that in order to mount the shelves in the unit in a more secure way, I'd rout a dado into each side panel to slot the shelf into and screw it in from the side.
That way it's well supported on the ends of the shelf without relying solely on screws (or glue).
I didn't think to take photos early in the piece, so we pick up when I routed out the first dado.
I clamped both side panels flat togetherto measure and cut evenly across both pieces, all the better to make sure the dadoes were at the same height on both sides. Don't want wonky shelves now, do we?