Re: howo make a fiber glass bow sprit
A custom bow sprit that overhangs your bow deck is not that hard.
The hard part is connecting the mod to your boat.
An 18' boat might be a little under structured to do this without modifications to your current deck/hull bow joint.
An additional Winch mounted on the bow/deck would further complicate things.
It is possible..but not really cost effective IMO.
YD.