Oh oh I have looked into a lot of this sheet. I will say I haven't TRIED any of this, but in concept it is all solid.
With custom homemade stilt things, you need NEED to support the joints or else you are in for a world of hurt. If you happen to step on a rock and the entire thing twists? There is a high chance an ankle can snap without proper stability. So you're lucky with those blocks not causing you issues D:
If you want ideas, I say look up 'Digi Stilts' on YouTube. Lots of homemade ones, and while you'd be going for a flat footed look? You can see how people make their ankle supports. OR Buy a pair of rollerblades or snow boots from Good-Will. They bind the ankle well to prevent twists.
For the chest, I say take a note from a very skilled person on this forum, and add to it.
http://www.405th.com/showthread.php/39172-Halo-4-undersuit-(undecided-on-armor)
If you layer muscle groups atop a base suit, you can have that buff look, fill out broad shoulders, and have a good foundation. From there, you paint on some paintable latex overtop to seal it all into one 'flesh' layer. But do know you will need to buy special latex paints to be able to get a real skin color. ((Using an old toothbrush to flick brown can give a natural speckled freckle look on limbs.))
This will be VERY HOT though, easy to overheat. As such, a tip is to cut out the underarms and make it a skin colored mesh to allow some breathability. It isn't in a super visible point, and is good to release some warmth. For full body suits they say to leave the back of the knees, groin, and underarms meshed. But you probably know this XD I just like to give out tips just in case :3