Mike,
Remember that your riding position, especially seat height will probably be a lot different on your MTB compared to your road bike. I ride with a significantly lower seat heigh on the MTB. Even on a FS bike you don't want to get whacked with a seat when your flying downhill (I need a dropper post, thx for the reminder) and you should be spending a significant amount of time out of the saddle anyway.
But it's a nice looking ride and yes, the newer FS bikes are huge. It's crazy how much bigger the Jekyll is than my FS Gary Fisher.