Tintop g60 project love some help

So I sold my sportline after owning it for 12 years and ended up buying a big project that I always wanted to do so here it is , tintop with smoothed g60 bay , thought I would put it up on here so I can keep track of where I am upto , 
Shell was 1.1 that somebody had painted  badly needs arches at rear , boot floor repair , sills as they have been crushed , had the bay started to be smoothed badly so going to clean off all under seal get it welded and painted add g60 fully rebuilt with hydrulic ctn  box , engine is as followed 
Rebored with plus 0.5 pistons polished crank baffled sump , new oil pump , man in shed head , Kent cam &pulley , redtop injectors , s4 charger , ralley outlet , rad tec rad& intercooler,
280 brakes rear disk with mk4 callipers
Eibac rollbars etc strut braces 
So here where I am stuck 
Fuelling can I use original tank? 
Dreading the wiring as no clue what I am doing let alone starting extending looms to hide them !! 
 

Bit more done today welded up all bay holes