Ok I'll bite, why didn't you just modify a P&D hobby F unit can interior? Please don't take this the wrong way your work is gorgeous... I'm just suggesting the P&D kit for savings of time.
F-units had a different type of control stand from the E8 and E9.
In an F-unit, the control stand is slender and cylindrical.* On E8's and E9's, the control stand is shaped similarly to the Alco-GE control stand, with flat sides and a rounded rear.
* Earlier E-units had the fat cylindrical control stand also used on switch engines. And late-model F-units and E9's had the "small cash register" control stand, a rectangular cube with plastic handles for the throttle and transition lever.