-- Last Updated: Jan-07-13 10:49 PM EST --
..... waiting to hear what the true condition of the gunnels turns out to be .
Originally you mentioned some possible rot and cracks . It now sounds like the gunnels are in nice condition and worthy of any efforts you wish to work onto them .
So I thought I'd chime in about an easy and accurate way to get the gunnel's edges rounded over like you wished . I know you can hand sand them to rounded edges ... but I just wanted to suggest you could use a round over bit (ball bearing guide type or non-bearing type w/a fence guide) in a router or a laminate trimmer , and then a quick fine sanding by hand . The round over bits can be the 1/4 round type (1/4 of a circle) , and in the size you wish most ... example , a 1/2" is what 1/4 of a 1" circle looks like because the 1/2" describes the radius of a 1" circle .
If there is any chance you can use (own or borrow) a router or laminate trimmer to shape your gunnel edges before finish sanding , I would do so ... you'll much appreciate the final outcome .
just a suggestion ...