Front end resto

Just started to do the bodywork on my car and decided to start on the front it’s a Bertone and has already been debumpered the centre section of spoiler is metal and it bolted on with four bolts but side sections look like after market fibreglass which cover whole of hole where old section used to be. Lucky for me these were not grated on but fixed with Allen bolts so came off easy but I’m now left with nothing from wing to wing . Don’t know whether to get metal sections and weld them in or go with fibreglass and fit them properly but I may still need to seal holes in metal sections . Just wondered if anyone has done this or knows of any other options ,spoilers etc.
Cheers

Would you be able to post some pictures as that will give us a clearer idea of the situation, thanks

It’s up my mates unit at minute mate I’ll have a go when I go up there
Cheers