My WW2 Soviet Army needed a Lend Lease Matilda II tank for a rapidly approaching game. The original model (see last photo) was a 1/72 pre-built diecast (by Altaya, I think) and was not a bad representation of the real thing. It took about three hours of work, but that was spread out over three days as a couple of stages involved letting washes dry overnight. I think it turned out OK.
It is based on photos taken in Ukraine in 1944 that show vehicles that the Russians themselves had repainted, covering over the British Army paint scheme and markings.