Hi mate, just saw this thread for the first time. Great work on the Turbo Javelin cage, I really like the whole idea.
However, if you look closely at the Javelin cage you'll notice it pretty much resembles the Optima's body lines. While you have made changes I think with a bit more tweaking it could look a lot more like the turbo Optima body shape.
For me, I think it looks too narrow at the rear and it really needs the wedge/wing section overhanging the motor. I know there would be a bit of work in it but I really think it would finish it off very nicely and look a lot more like a Turbo Optima.
Cheers, Keith