After looking at the pics closely, here's what I see (good and bad) on the Abbyshot Harkness coat...
1) Rank braid is incorrect, as well as incorrectly sewn to the epaulet (as mentioned previously). I'd replace with more accurate braid and sewn to be screen accurate. :thumbsdown
2) King's Crown RAF buttons are correct, but these appear to be rather poor copies. I'd replace with originals. :thumbsdown
3) What's with the buttons spreading out as they go up the coat? Geez...might as well be on the shoulders when they reach the top row. The button spacing from left to right does increase as they reach the top...but not
that much.
thumbsdown
4) Fabric looks pretty good on the monitor, but would love to handle a sample to see what it really looks and feels like. :thumbsup
5) Buckle on the belt is probably way closer to correct than any of the eBay/cosplay options. :thumbsup
I think I'm still going to get a cosplay one and make the mods to that, rather than spend double the amount and still make the same mods. Of course, that opinion is subject to change if someone gets an Abbyshot and posts pics of a production piece rather than the manufacturer prototype from their website.