The Linestage with its very similar SE version of the Merlin front end almost got put on a single board. I didn't so I would not have to disconnnect the small .3 mA CCS I robbed from another pair of amps.

Either way, with a pair of heatsinks, ir should be done with a few square inches. I will work on this. One of the guys who bought a pair of the OPTx's is good with PCB software.
cheers,
Douglas