I decided to add some flares to the rear.

I show these using the Evergreen Styrene. HOWEVER, if you don't have a hobby shop nearby, check your local Dollar store/Wal-Mart. Check out the FOR SALE/GARAGE sale signs. They are usually $1.00 and work perfectly.
I trimmed and tacked in the flare bases with superglue. Superglue sands easily so not to worry about a little excess.

The excess I will trim away with a cut off disc later when the resin dries.

That's right, RESIN. I will flow a very small batch of resin over the flare bases and allow it to flow over and drip off. I like using the Smooth On product for this as it just sands smoother to me.
I just mix with a toothpick and then take the toothpick and drip the resin on the seams.

After drying I sanded with 600 grit paper to start shaping. The first attempt seemed to come out pretty well.

This shows how I trimmed the excess away.
I sanded and shaped them with a Dremel sanding barrel. I literally ended up removing almost all the original flaring base. That's ok though. The resin created the shape I wanted and those strips were just a base for the resin anyway.

Not bad. Little more feathering with some sandpaper to do.

The amount of flare was set to almost sit flush with the 2 1/2 width. Close enough.

Getting closer. But I am leaning towards flaring the fronts. Not really seen prototypically, but this is a free-lance shop after all :)