I am currently working on Tamiya's 250/9 and I agree that the Tamiya 250s are often overlooked little gems. I would suggest using the Tank Workshop fenders though. They are inexpensive, drop riight on, and are the correct shape for the 250. If anything, I would strongly suggest the following, saw the bottom half of part B24 off where it meets the bottom of the hull and scratch-build the lower half to its correct rounded shape. I have no idea where Tamiya got the configuration for the front armored plate on their 250s as I have never seen this configuration on any of the 250s I have seen in photograghs of the actual vehicle. Good luck with your build, I will be following it closely.