I spent some time, profitably as it turns out, fitting nipping, grinding, sawing and hewing with a @11 the cockpit assembly and fuselage shells. I do believe I got it.

Shedding a little flash on the matter shows the seat may be too tall and the headrest simply won't do. Thanks Mike for your excellent reference photo of that particular detail. Still working out the fabric panel behind seat, fabric storage box and oil tank. Not so sure the storage box need be represented past a closed opening.

The instrument shelf was surprisingly amenable to adjustment and now fits well. I held off on instruments until after all the fitting. No sense in sending young Frank to war with half an airspeed indicator.

In a fit of nearly unprecedented forethought I made sure the cowl fit was unhindered and ....wait for it... Checked that the lower wing could be installed with the joystick and rudder bar in place on the center section of the wing. It fit just fine, the joystick will be added to the support frame through the cockpit opening after the wing goes on. I even checked that for fit and feasibility.

Knowing that the fit is good has been a big morale boost Finishing the interior work I mentioned will seem easier now.
sp