I knew the glass on mine was delaminating because there were large "bubbles" in the glass. when I poked through one and pulled lightly one it the glass came off in large pieces. Most of the glass came off that way, the rest I used a heat gun to loosen it. It took less than a half hour to strip it all. Having said that, my sister has my Dad's Northland (built early 1980's) and the original glass is still good, no delamination. If the glass is sound, then just patch any holes, sand it smooth and repaint the hull (as Andre suggested). I'm repairing mine now. I had re-glassed it years ago and 95% is still in great shape. I had a small leak in the hull and there is a spot where I removed some glass and will patch it before painting.
When I re-glassed my canoe I kept the keel off (a preference) however this time I'm putting it back on. The wood on the hull is old and brittle because it can't be oiled. I noticed the hull flexes when I get into the canoe, creating a series of micro cracks. This allows a small amount of water to seep between the glass and hull. I can see this where I am applying the patch. I believe the keel will stiffen the bottom and stop the flexing, so am putting one back on. Maw put keels on all of his canoes.
I stripped the canoe outside because of the dust & fibres. Wear a good mask and goggles and you'll be fine. I've glassed indoors but had the room well ventilated and I do wear a VOC mask. The new epoxy's say you don't need to wear a mask, but I do as a precaution, same with ppainting and varnishing.. Long ago I used a polyurethane for the inside of the hull & gunwales and it's flaking off now due to age. I'm going to sand all of the loose stuff off, clean it well and use a good quality varnish. I'll let you know how it all goes.
The last contact I heard of Maw was 3 or 4 years ago when a friend was there. I'm driving through Novar this week and if time permits will drive by Maw's place to see if he is still around.
If you're in the Pittsburg area, look up the Three Rivers Chapter. They have a number of experienced canoe builders / restorers and I'm sure some of them would be happy to offer some advice, maybe even come by to have a look.