In this russian site there's information about the plane,
and two links to a couple of 3-views (both indicating
different dimensions - two variants of the plane?)
The site:
ОАК :: Ил-76
This are the direct links to the images:
http://www.uacrussia.ru/common/img/u...heme_3view.png
http://www.uacrussia.ru/common/img/u...heme_3view.png
Apparently the dimensions are given in centimeters.
Sadly, they're very general layouts, not too detailed
and only indicate the main dimensions.
But I hope it's useful for you.
Edit:
Just found another image. also with general measures,
but this one has a cross-section of the fuselage,
and also shows the internal layout:
Ilyushin IL76 Freighter Aircraft
Another internal, with some measures:
http://www.unitag.co.il/upload/il-76.gif (from:
IL-76 )
also:
Aircrafts Specifications - Samarkand airways
2nd edit:
another 3-view indicating the angle of the leading edge:
Самолет Ил-76. Аэродинамика и динамика полета. Конструкция самолета
And a beautiful cutout:
http://spisok500.narod.ru/images/il-...-shema_002.gif
(from
ил 76 МФ)