I’m nigh on sure that it’s a P-40D onwards see pics of the panel Olivier mentioned and the seat. So we’re talking possibly of an original shark-mouthed Kittyhawk, interesting stuff, shame this is all that’s left.

Tom

Photo credits: Steven Stohr

http://www.aircraftresourcecenter.com/AWA1/101-200/walk139_P-40E/walk139.htm