Glad you finally got the model you've been searching for. And oh what a sick model that is. Now I'll give you one of my FC's for it
. Anyway, I think you should use the Advan RG's. That'd look tight.
I make my exhausts with some brass and metal tubing. If you need any help on how to keep them together, I'll tell you what i did (you can see what it looks like on my Efini RX-7 FD). I don't feel like typing a whole bunch now.