I like the Katadyn Units and I did a cost comparison btw the units and this is what I came out with:
I like the Katadyn units and this is what I figured out in my research and price comparison. These are the units I looked into:
1. Katadyn Pocket(up to 13,000gal before filter change) MSRP $370...
Tenzing packs are amazing. I spoke to blacks creek and they are changing their line up and I believe they are going to start making everything in the USA.
For my rough weather tent it will be the Nemo Tenshi: http://www.nemoequipment.com/nemo2011-tenshi-tent and have not decided for for my lighter weight tent.
Soles for me. I like the different thickness that have. Some time when I change to a thinner sock I put in a bit thicker sole foot bed and it works out great.
I would not try and modify the tent as i am not that creative:) if you knew what you were doing and had the correct thing to do it anything is possible.