Pics of cracked ribs...need replacing?? Keep in mind I am a novice and I will be using this canoe. I will be going back w.canvas in g.s. green. And will be stripping/sanding/re-varnishing also. I want to do a good job at getting her back original and sound.....would like some expert opinions on the ribs...I only found a few that are cracked(see pics)...do I need to replace them since it is only a couple??