Several years ago I build a computer generated three-dimensional model and virtual reality walk-through of the Sistine Chapel for a class at BYU. I wrote about this on TempleStudy here.
It appears that the Vatican has commissioned an official virtual reality simulation of the Sistine Chapel that I just stumbled upon, which you can see at this link (http://www.vatican.va/various/cappelle/sistina_vr/index.html). This is a bit different than a true 3D walk-through, however. It is a stationary 360 degree photograph that you can pan/rotate and zoom with your mouse. Still incredible though, far more accurate than my reconstruction, complete with choir music.
The Sistine Chapel remains one of the most spectacular artistic masterpieces in the world.
One interesting detail of the chapel is the screen or partition in the middle of the room, also known as a transenna. Wikipedia describes how this screen creates separate and distinct areas:
A screen or transenna in marble by Mino da Fiesole, Andrea Bregno, and Giovanni Dalmata divides the chapel into two parts. Originally these made equal space for the members of the Papal Chapel within the sanctuary near the altar and the pilgrims and townsfolk without. However, with growth in the number of those attending the Pope, the screen was moved giving a reduced area for the faithful laity. The transenna is surmounted by a row of ornate candlesticks, once gilt, and has a wooden door, where once there was an ornate door of gilded wrought iron.