Morning LM,
I think that Martin is probably close enough with the Convair C-131 but OH if you judge otherwise, it's an early start and a busy day ahead with short breaks!
However, in case you've got your "Strict-hat" on, it wasn't a prone cocpit. It's the Convair NC-131H TIFS, (standing for Total In Flight Simulation), it had an additional two seater cockpit with exceptional all round views, also, turboprop engines and and wing mounted fins so that the handling characteristics of different aircraft could be simulated without building prototypes.