I'll second what Matt said. If you're 6'5" tall, you'll need to gain another 7" before you're the same height as an unarmored space marine. With the added height of the boots and helmet, they get bigger still. So get yourself a pair of 7" platform shoes and start getting in shape for your smooth, agile, and graceful movements.
Short of finding someone 7' tall to wear one of these things, there has to be a compromise somewhere. We set out to build something imposing and iconic. To get it to look right, we're sacrificing mobility and comfort. It would be easy enough to make a suit to fit someone my size (I'm 5'7" by the way) but it wouldn't come anywhere close to the kind of mass that I'm looking to emulate.
In the end, the whole thing will just be vacformed plastic and some cast resin pieces. The finish work will be what makes it look like it weighs a ton and stops bullets. It'll be up to those of us wearing these suits to work out a way to make them seem heavy while still giving them notably dynamic mobility.
To maintain mobility, my hips and knees will be very close to the location of the character's hips and knees. My ankles will be half a foot higher than the character's ankles, but there will still be flexibility there. My shoulders will be very close to the character's armpits, but with the suspension plan for the arms the difference won't be all that noticeable. The only thing that will be even a tiny bit awkward will be the slight immobility of the neck. Given the design of the armor, I'm pretty well convinced that these guys wouldn't be able to move their heads all that much anyway.
Photo update, here's Matt with the first assembled pull of the three torso parts:
Here's a quick doodle showing the positioning of the wings on the chest:
Here I am trying it on:
Over the weekend, we should be cutting up some of the other prototype pieces and getting them ready to serve as forming bucks. We also need to hurry up and get a pair of the boots together so we can start stomping around in them.
Stay tuned...