If you are looking for Standard measurements, you may want to refer to this sizing chart, if you have not seen it already:
http://www.gibson-barnes.com/index.php?id=46
No doubt, 40 Tall measurments would be adjusted somewhat to accomodate additional height. Best to consult with a Salesperson at G&B for exact details. You can use a suitcoat that fits best, and take measurements from it, mainly sleeve length, etc.
A true Indy jacket is slightly longer than suitcoat sleeves, in that the suitcoat sleeves will fit at the wrist, whereas the Indy jacket cuffs will end at the first knuckle of the thumb. Also, an Indy jacket should end at 1-2 inches below the belt, depending on how long you like for the jacket to be. They will put a hidden snap at the bottom of the storm flap, and it is possible to get it lined with thinsulate.
My lamb Expedition has become my 'grab' jacket, and I like how the grain of the leather becomes more prominent as it gets older and broken in. In terms of personal qualities, its like a thumbprint of individualization. It's unique, and you notice the nuances of the leather, grain, how the collar lays, for instance, attributes that set it aside from other jackets. You will also get a better perspective of just how sturdy the jacket is in terms of its construction. I have had absolutely zero problems with the purchase of this lamb jacket, as even the lamb hide is quality, durable leather. In terms of the toughest leather, goat is obviously the preferred choice.
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. So, I may end up going w/ a 40R or a Wested custom if need be. But anyhow, thank you again for the replies & guidance!