Great pics!!
That is a cockpit of the P-51 B/C . Not the P-51D. Exactily this plane was powered by the Merlin Engine, opposite to previous ponies where they powered by Alison engine. This is ther reason of the wooden floor. Well, I didnt know that the yellow box belonged to Britt planes..the reason of the yellow box here could be that, as you know, Brittain made to US a order of production of P-51 B/C....and they received the name of MUSTANG III. So that pic could belong to a british P-51.
(S)