I've only removed the CNG cylinders and kept them in my store room. Just in case. Don't sell them, they are made of very high quality solid stuff and you won't get enough in return so why bother. After removing the cylinders, block the cng intake pipe with some rubber plug etc.
Regarding dashboard cracks, your best bet is to visit Bilal Ganj (Lahore) and get a full replacement dashboard. I've heard about Sitara Market (Peshawar) as well but haven't been there personally so not sure. Don't go for cheap repair as it will keep on making noises as you drive on rough city roads and will give nothing but headache.