As I feel, there are some slight misinformations among the answers, I'd add my 2 cents as well.
First of all... nearly every wooden frame folding kajak for itself is able to swim (right below the waterline though) and will not sink, unless you have loaded it with stuff. Said that, it all depends on what and how much you have loaded, no matter if it have sponsons or not. In case of the AE2 you can rely that it will stay afloat even with normal touring package. If you want to add even more savety, then I can suggest, you just use simple inflatable beach balls for children, which costs almost nothing, but does exactly the same as expensive stuff - and just put them into the front and rear tip before putting your frame into the hull.
Preparations for deck lines are not common with older (vintage) folders. I suppose, its because people back then didn't need as much stuff as today.

I for myself dont like it either to put much pressure force onto the canvas. The danger of damaging it... and even if not - it will deform, which is ugly anyway. The AE2 does have lots of space in it. Usually enough for tours.
Nice to see, that you have patched the holes nicely. I hope you got material based on rubber (not PVC), and that you used some kind of vucanizator - just like on bicycle tires?
Your boat has a (organic) rubber hull, thats the reason, why its already looking so used. Rubber is dissolving over time by UV light and heat. It first gets greasy and sticky and then it gets hard like carton, the coating fells off like powder and it gets leaky and unfoldable (thats gonna be the inevitably future of your hull as well). Not hard to imagine, that glueing new patches on a dissolving underground wont get you very far.
Judging from your pictures, I'd say, your hull is good for another few years with ease and the patches directly on the hull will hold (if done correctly, mentioned above), but the ones on the keel strips might fell of again, as they dont look in good shape (which is normal). Make sure, those stipes are still holding well themself - or exchange them. The hull beneath them might be in a good shape, as it never has come in contact with UV light.
Keep the rubber out of the sun, if you can. And you might look for the so called Klepper-Milk to rub it in 1-2 times a year. It helps staying the rubber soft and nice. An old lady needs its lotion.
