I don't like the lack of paint on the rubstrips, and why did ford continue to use the grille blinkers, even though they have the headlights with blinkers? i think it has something to do with the cost cutting going on. If I was a dealer and were to sell that car, I'd make sure all the unpainted plastic gets painted, and put on atleast a 99 Ghia grille.
you could easily get a bigger tank set up in there at the expense of some cargo room.
2.8 KGs = 125 miles
1 LB is about 0.45 KGs (actually it's 0.4545 Repeating)
so 2.8 KG is about 6.2 LB. 6.2 LBS bottle = 125 Miles, 20.2ish miles per pound.
a 40 lb tank would sacrifice some cargo space, but it would get you past 800 miles. a 15 lb tank much like you would see on a pretty serious Nitrous setup would get you to 300 miles or so, which is about average for what people are getting out of their ZX3.