Matt, are the sounds in the latest video representative of the final product? Love the whistle, but the chuffing at high speeds is inaudible (unless it's the video degrading it). May I politely suggest that at high speeds, the sounds be a looped recording, like on MSTS, as they always sound more convincing (even the RSC Tornado and Hall would be better like this). Good luck with completion of this astounding project.
Regards
Chris