ABY/Hotbox w/ line out & headphone jack

[firemedic]

I have a small chassis & transformer that beckons to be used in a tube project.
I would like to make a tube ABY box, as transparent as possible, w/ 2-instrument-level out and 1-stereo headphone jack. For when the family's asleep.
Since I have the room & power for it I can relay-switch a Hotbox- or TOS- style (or whatever) OD circuit in there. That's something I know I can do.

Any good ideas as far as the ABY circuit & headphone out? Those are the part I'm not sure about.

[firemedic]

Bueller?