Great post. Really interesting read (I still gotta go check the Spidey one). But back on the fictional canon, it wasn't only the serum what turned skinny Steve into Cap Steve, the Vita-Ray developed by Howard Stark is what helped the serum succeed, hence why the Red Skull, the Abomination and even Black Widow & The Winter Soldier (all of whom have been injected with variations of Erskine's formula) aren't quite like Steve. I think it's a 50-50 between serum and vita rays so, if both are possible in the real world then we might be able to create a real-life Steve Rogers, but if there's only one or the other, idk...