It's not entirely my bag, but then you probably don't like my 240 shell as much as I do either
I like the stance of the car and wheels, and if it had a proper roof and two less seats I'd definately want it.
I'd leave the badge off, I think it looks very smooth and nice as it is.
If you sold the car to me I'd:-
Change the front bumper to a 99 spec one (my current favourite), but if I kept yours i'd flush mount the indicators into the front bumper somewhere.
Move the plate, probably up onto the front of the bumper sticker style like you said.
Retrim the interior to match the outside of the cars looks.
Fit some decent component speakers (in kick pods probably) into the front and a quality HU.
Made sure the engine bay was really nice, make sure the car is clean, everything worked as intended, and was a generally tidy car.
Dewiper the rear and see how I got on, just filling the hole with a grommet for the time being.
And then I'd stop looking for things to spend my money on and be happy with a very nice car!!