Thanks for your interest in a DIY Packraft kit 🙂
For your intended use, an Ultralight would suffice, but for more peace of mind the Skeena would be better (I think a Telkwa would just be extra weight and bulk).
I used the shortest (120 cm) Skeena on my recent 30-day trip and it was more than tough enough for use in the lakes, class 1-2 rivers, and barnacle-lined fjords I paddled. It never leaked in spite of scraping down shallow rivers and bushwhacking for dozens of kilometres through thick forests with the packraft unprotected on top of my pack. Tracking was not a problem and I was able to paddle more than 30 km (20 miles) in a day (not downstream) averaging between 4 and 5 km/h (2.5 to 3 mph). I do not have a zipper in that packraft – personally, I don’t need one, but they do make the final construction steps easier.
On that trip I ventured up to about 800 m (1/2 mile) away from land, and aside from the seat, back rest, and my PFD, I didn’t have any additional air chambers. I did wear a drysuit for one ocean section I was worried about, but it wasn’t really necessary. So often we choose gear based on our fears, and my recommendation would be to resist that impulse.
I wrote a post covering some of these topics a while ago: https://www.diypackraft.com/faq/choosing-a-packraft-not-just-diy/
Cheers 🙂