The one thing I thought was Carbolite frame incomplete seat post. Oh dear. Those bikes take a funny sized seat post which are, quite frankly, like rocking horse poop.
On the subject of long legs and frame size; If you have long legs for your height then the last thing you want is a large frame. You will have a correspondingly short torso and so will need a short top tube. In that case always size for the length of the TT and just raise the seat to suit your legs. 6'3" with a 38" inside leg would give you a shorter torso than me and I'm just short of 6', my smaller Peugeot (23.5"-ish depending on which measurement standard you use) is right on the limit for me length wise so it would suit somebody with those curious dimensions.