"…noticed you put a gear list up for the Bob. I'll see you there bud."

Yeah I'm pretty sure I can make it. Work is still a bit of an unknown but it looks good.

I whipped up that list pretty quick but it's a likely strategy that I may take. Obviously I have a pack raft and if I went that route my list would be really different. I haven't really planned my route yet (waiting on maps which are in the mail), so that will affect gear decisions a lot.

"what about a modular system in which you have several different inflation "tubes" that you can stuff places."
I think there would be a place for a design like this. If I was planning on running riskier water where there's a chance I get chewed up pretty good then I'd want more redundancy in the chambers. For me, I plan on mostly running class 2-3 in the wilderness and I feel pretty comfortable with risk I'm taking on. If I was thinking about class 4 water then I'd water additional precautions. I do want to get into some class 4 in local waters, but I'd probably just buy a cheap foam inflatable for this.

With regards to the design, perhaps a mix of tubes/chambers and Platypus bottles would work well, because you'd add redundancy and use gear you're already carrying. You could also make a PFD with a few (3?) non-removable chambers, but then it would also have smaller pockets for 1L or 500ml platy bottles that you could stuff in there too for gnarlier waters.

It wouldn't add that much weight to have more chambers. You're looking about maybe 0.3 or 0.4oz for a valve. You wouldn't want to have ten, but 6 instead of 3 would only be an extra ounce, plus likely a bit more fabric for the separate chambers.