The stem has to change (for my comfort at least) as I'm really stretching over the bike, but with the handlebars the width isn't the problem, I've just spent over 6 months using flat bars, and I find everything else really uncomfortable now, they are the only issues I've got with it really. The dropper was just an idea, but I'd probably rather put that money aside to build myself an AM bike anyway. 
I know I can't go crazy on this, but that's probably a good thing anyway, as my fitness/fatness is probably my biggest problem ATM, so it will do me good to get out and do the miles. Can you see the bike having any problems with Glentress red? I can't myself, but I can't remember much of it.