I doubt the dent could be pulled or pushed out, but I'm not positive. Never tried anything like that. To smooth it back into shape, you could fill it with auto body putty, such as Bondo, and paint it.
Plastic end caps (decks) of various sizes can be found for sale on the web if you search. For example, here:
northwestcanoe.com
Plastic end caps (decks) of various sizes can be found for sale on the web if you search. For example, here:

END CAP - ABS
ABS plastic canoe end caps for finishing off the ends of gunwales. These will work on a variety of makes and models. We can not be sure end caps will fit without actually trying them on the boat. However, to get as close as possible, Here are some pointers. 1) Notice in the pictures how...
