Resident Evil weapons (airsoft)

the flamethrower from RE (origianl) and RE2 are based on the Aliens m240 flamethrower, it used a m16a1 body, and other added parts, and there is no room to make it the way others are making theirs, also the flamethrower from RE remake is a bit different too, and do u guys think i could make them using other airsofts weapons and still make it look like a flamethrowers?