Thanks for your interest guys.
Here's the finished instrument panel. Mike Grant instrument decals for jets have many different modern instrument faces and I selected those that appeared to be close to the RAF WW2 instruments. They were cut out individually, placed into the bezels and several drops of Future were added over time. The throttle assembly is the kit part with an extra control rod and knob added. Edges of the panel were traced with a silver pencil and placards were simulated using white paint.

The cockpit floor was modified and then painted. The floor panels next to the seat were cut out as this area was open. Straps were added to the rudder pedals using aluminum foil tape. There's also an extra strut that was added just in front of the seat using round rod.
After all this was done. I trial fitted the floor into the fuselage and found that the area forward of the pedals was visible. There was a large fuel tank there so I went ahead and added that using rod and card.
Here are the finished sides:

Fitting the instrument panel involves some fussing and fighting but, after a lot of trial and error, I found out that the key is to allow the side panels to sit on the horizontal framing on the walls and forget about trying to line up the upper edge of the panel with the coaming. This is the only way that it will fit properly. One reviewer had trouble here and ended up trimming the panel to fit but I don't think it's necessary. That said, I did cut off the extreme lower corners of the IP, not because they caused fit issues but rather because they weren't there on the real aircraft according to reference that I used.
In the above pic, there's one more detail to add just above the throttle. There is some kind switch that needs to go there and it's an easy add.
Because of the gap that's created at the top of the panel, I made sure to paint the exposed face of the locating ridge on the other fuselage half black as this will be impossible to get at when the fuselage is buttoned up. I painted the one in the above pic after I took the picture.
Back to the bulkhead behind the seat, closer looks at the reference pics revealed that what I did there wasn't quite kosher. The lower portion of this bulkhead is actually open to the rear. Rather than tear it all out, I made some additional framing and painted the in-betweens black. This is a decent compromise I think as, once everything is buttoned up, this should look just fine.

For the seat belts, I once again decided to make my own rather than wait 2 weeks for Eduard ones to get here so that will be covered in my next instalment. Thanks for looking.