Here you go.
First pic (PDF) is from squadron Signal 'Beaufighter in Action', and the only shot I've found so far of the cannon bay.
The rest are from my own pics, of the Duxford Beau under restoration.
The pics of the radar and diagram are from 'Aircraft of 100 group.
The diagram shows the installation for both sets, the first pic is the earlier AI Mk1, second is the AI MkVIII, in this instance in a Mosquito. Installation in the Beau was the same as the Mk1 above.
You should find the Tamiya kits cockpit acceptable, maybe with a few additions in the way of throttle levers etc. Note that the radar operators seat would be swivelled to the rear when in use, facing the monitor.
The 'boxes' on the floor are the ammunition tanks for the four 20mm cannons, which fed via curved chutes, through the 'floor', to the weapon's recievers. (Mk1 Beaus were drum fed, loaded from inside the fuselage.)
I've got various internal shots, but they are a mix of Mark numbers, including the Aussie Mk21, patched together to make one airframe! For internal details, exhausts etc, just refer to my 1/32nd scale model - it's easier than me having to find the relevant pics for the details, as there are bits all over the place!