A see through engine cover will not allow you to see the throttle bodies. The part above the TB's is the intake plenum, so you would have to have a see through intake plenum. It would look cool for a while, but with all the crankcase ventilation oil and what not going into it, it would look like crappola pretty quickly.
Cool idea, just don't think it's practical.
2011 335is coupe white/red
06 kawasaki ZX6R in Kawi green