I like the desert colours and red spinner on a Spitfire, you have done it proud "Q"
Only thing that is out of place is the antenna wire. The Mk V had a VHF radio so the wire wasn't required, only the earlier Spits with HF sets had it. The nobly bit on the aerial is the mounting point for the pully which was only fitted to masts for HF sets, it was part of the manufacturing process and so wasn't deleted, the pully was a seperate item, so was. The IFF antenna are correct, although later in the war they were deleted as well because a different system came into service. Basically the change over happened at the same time as the head rest was deleted. So if you have a headrest in your model you shoukd have the IFF wires, if you don't then no IFF wires, simple really
Still a cracking Spitfire
Mal