Raw materials for the frame - Victorian hardwood...The frame has four rails. These were reclaimed from this lovely old door. It is a Victorian door from a specimen cabinet from the Natural History Museum.
The door frame rails were sawn off
To give these...
You can see the innards of the door joints...
The thicknesser leaves the wood smooth as glass.
The corner joint were then cut as mitred lap joints.
They work like this...
Actually after sawing you get rough faces like this, which need cleaning using the rebate plane
Those tenons might look neat, but they started with glued in offcuts like this...