I think the main difference is that I tried to make these as "mego-y" as possible. After assembling bodies for the past year with parts from various sources, I was looking to simplify the process.
I also felt some of the parts I'd used before were over-sculpted (i.e. too much definition). I've tried to give my parts a more natural look. I really looked at Black Kryptonite's legs for inspiration (not his real legs, but the ones he sells). He seemed to get the less is more approach I was going for. So with several months of work I was able to create a similar leg to his. From there I just kept going. Black Knight has a tremendous torso (again, not his but the one he sells) that I've used for several customs. I found a similar torso on a wrestling figure and modified it to accept mego neck plugs and shoulder joints.
All of my parts are made to be swappable with a t2 mego (i.e.. any individual part can be swapped with it's mego counterpart and work).
Once my "skinny body" is done it will work the same way. I could see some customs (like Flash) that would want bulkier legs but a leaner torso.
the big test will be how it strings together. my plan is to use t2 rubberbands to attach the limbs. If I've measured correctly, it will be a nice tight posable figure.
Fresh, not from concentrate.