Nice work mate! You're right, it's a shame a lot of the interior detail won't be seen. A few years ago (well, a lot of years ago!), I made a Mitchell II out of the old Revell B25C kit, and spent bl**dy ages scratch-building the interior, as there was nothing in the kit, only to be able to see - not much!
Thanks for the reply re the colours. They should actually be Inteior Green (basically the same shade as ZC) and Bronze Green, with a sort of 'sage' green quilted padding on the cockpit walls and bombardier's comparment bulkhead and walls, but if the instructions state what they state.....! Pity, as somewhere on the forum here, I posted some interior shots of a B25C/D, still in original 'factory finish'.