You are right, brother. GD does not come with a fuller fender that's why the space looks empty. Same volume of space is available in other 100 cc category bikes, but that is well covered with fenders which is why the space is hidden. GD should have had a proper fender. It's a total fail in Pakistan's environment as the roads get really messy in rainy season like these days. Plus, even if there is no mud, rain water would still ruin the rider's clothes due to splashes all over and around the bike. Bad thing for GD GD's fenders cannot even be replaced with any other fenders due to color matching issue Fitting would not be an issue, a good mechanic would eventually make a good fitting.
Yes, I also think the same that a bigger tyre would complement its looks and make it look more fiercer and muscular like Ravi Piaggio. For fender, it's seems like a good idea to wash the bike every week. But it is not a practical approach for a lazy person like myself Moreover, even if you wash it on a weekly frequency, it would ruin the rider's clothes anyway while riding on wet roads.
While I was at showroom for purchasing GD, the sales person told me the fuel average would be somewhere between 45 - 55 km/L. So no point weaning about fuel average now You are right, GD's engine is compared to CG's engine. So we should expect a matching fuel average too. However, even if GD manages a 50 km/L average, it is still a good value.