I used the Woodrat to do the main cutting of the tenons. First using the "block" method: Position the cutter so it'll cut the back side of the tenon, then make a block of wood the same width as the cutter diameter (12mm) plus the width of the mortise (9mm) to go between a rod (held where the fence rod would usually go on the router) and the stop. Cut the back of the tenon.
Then whip out the block, bring the router forward so the rod is against the stop and cut the front side of the tenon. Perfect fit, apart from a shaving or two of adjustment - as intended of course. A lot of rod-like bits and pieces in the pic there, but I hope you can make out the gist.
I could have done a similar set-up for the crosscuts to make the stub tenon complete, but I just marked a pencil line...
... and split it with the 'Rat by eye. And yes, you can split a pencile line with a router, 'cos that's what I was doing. :~P
The #140 earned its keep, as intended, easing the thickness for a nice sliding fit.
I decided to round the tenons rather than square the mortises, taking off the bulk with a couple of vertical paring cuts with a chisel...
... and then filed to finished shape.
The ends of the tenons are mitred so the ends will be just shy of each other in the joint. The moment of truth...
Perfick. Makes up for all the dozens of joints I've cut in my wood butchering career that haven't fitted correctly.
A dry run just to see how things are coming. The legs are still to be tapered, but it's looking as expected - which is nice...

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