I've got to hand it to you, your fabbing skills are great, man. However,my conscience will not allow me to NOT speak up on this, please keep in mind I'm NOT being negative.
As pointed out the danger of turbine failures can be quite severe. I too work on turbo machinery in a chemical plant. The company I work for had a small turbine overspeed some years back, ending in a fatality. The turbine wheel went thru the cast iron case (approx. 2 inches thick) and cut a man in half.
In retrospect, the setup here wouldn't be AS dangerous if the driver's seat weren't directly in the line of fire of the wheel should it fail. Had the turbo been turned 90 degrees, The shrapnel would radiate upward and to the sides of the car. This would still be dangerous, but nowhere near as dangerous as the current setup.
I would strongly recommend at bare minimum a 1/4 STEEL scatter sheild over the sheetmetal box.
Life is great, especially when you're still around to enjoy it. The man who died in the chemical plant is missed by his family....
Now, with doom and gloom out of the way, again, the project is cool and innovative, keep pluggin! ....And posting pics!