I've repaired a few boats like this.  I've tried alsorts to get a nice finish!  Using film over a large area is hard to stop wrinkles etc getting in.  The stretchy film might be better (wasn't available when I was repairing boats).  IMO the best option would be the coating resin but I did mine by sanding off the affected area, paint on a thin coat of resin (something like EL2), sand, coat, sand, coat....etc until you've got a good layer built up then coat and sand smooth followed by a final polish up.  This will make it as new.  You can do the build up part just in the gouges / cracks to save resin / effort until you have a level surface.  TBH though, your boat doesn't look too bad, I've seen alot worse!