Does anyone have experience with this or otherwise offer me advice?

I have two older Wenonah kevlar canoes, a tandem and a solo. It would be so much easier to store them--and transport them--if I could figure out how to nest them. But that would mean replacing the existing thwarts on the tandem, or at least some of them, as well as the seat attachments, with ones that could be easily removed and reattached. It sounds like a big job. Has anyone done this? Any advice? Should I even try?

Well, my current canoe has a removable yoke, and I know Souris River does removeable thwarts, or at least they used to. I don't think it would be too terribly difficult if you're handy. However I can't imagine it would be a good idea to store or transport it with essentially nothing supporting the shape.

I can sort of understand the storage goals. Nested canoes would take up less space in the garage or wherever you're storing them.

Describe your transporting issues. Seems a lot more logical to carry two canoes on a rack built to carry two canoes vs. taking the time and energy to take out the seats and thwarts to nest them together, then reassemble them once you're at your put-in spot.

It's mainly for storage.

I wrote to Wenonah Canoes this afternoon. Here's the reply:
Hi Yes, it can be done and is standard practice when you nest canoes prior to lashing them to a float plane. Just replace the rivets with bolts and wing nuts. Simple and easy. WC

Look closely at how much length you have available in the larger canoe. Some float chambers really shorten up what you have to play with. I nested a 12 foot ADK in a Wenonah Champlain 18 so I could haul three canoes. When I get to the float plane the ADK slips inside the Otter for transport. I have never nested canoes on the plane. I think it could be a real time consuming affair as some thwarts would need to go back in the larger canoe to withstand the stress of the tie on ropes.

overland: "I wrote to Wenonah Canoes this afternoon. Here's the reply:
Hi Yes, it can be done and is standard practice when you nest canoes prior to lashing them to a float plane. Just replace the rivets with bolts and wing nuts. Simple and easy. WC"

+1. It works fine. We did this for several years with a Wenonah Champlain and a shorter Bell tandem. The Champlain was an outfitter canoe so it already had the wingnuts/bolts in place. Thwarts, yoke, and tractor seats were easily removed and reassembled. We did this primarily for transport, not storage. Mpls to Crane Lake or Ely, and back at least once a year.

I've got a tandem and a solo that I am hoping to nest or stack over the winter. I've got sawhorses, just need to make the time to get it done.