If you haven't been, You'll love the S fork - We did it way overloaded in a Smithfly 3 man. I had good outfitters on both ends, but the raft hardware got pretty beat up going in. If I were to do any pack in again, I'd be clear on when they're going to pack the mules and be there to 'help'.
However, I've also got an Aquaglide inflatable 2 man kayak. After seeing that I ended up rowing more than fishing in our situation, I think I'd bring that, running solo, and we'd all just stop to fish. Fewer mules to rent. And with a patch kit, you will make it home.
I'm a little scared of that frame/hardware and the overall burliness, if you are a savvy river guy that helps, but you are way in there. You should be solid on Class 3. We saw probably 20 packrafts, and outfitters whitewater rigs, no pontoons. That rig looks ok for flatwater, or the Madison, etc., but I wouldn't take it into a wilderness situation.
I wish we had milked the upper for bulls; we were concerned about making time and needn't have been, the lower can go pretty fast. And there is some stout water thru the Canyon. We needed every inch we had higher up, due to way over weight, thru the skinny water, and a couple hundred more CFS in the bigger water would have been pretty damn western. Make sure you can repair anything that is mission critical; it would be a long, long walk out.
I would get pro grade 7' oars, I run these (think mine are 8') for the raft:
SAWYER SMALL STEALTH (SST) OAR
You need 3. Those stock oars won't make it, sell them or save them for lakes.
Take some mahogany / brown attractors,and Adams. We had bad beta going in and our selection of dries was mostly attractors, and the cutts were much more selective than we'd been led to believe. We also were surprised at the people; quite busy. Make camp early and fish. Main horse trail and therefore campsites tend to be river right, with obvious exceptions.
Stay laser focused on river right once halfway into the Canyon. Really pay attention for the Gorge pullout. It doesn't look like the photos. There is a big beautiful obvious new pullout river right. The wooden sign further down is past the pullout, and the older pullout cove, and hard to see anyway. There is an obvious cliff pinch beyond, wth a log across high, and it dumps to the right. We missed the pullout and had an epic.