Mine is a Singlular Peregrine, very happy to share info by emial if you want.
I run 42 front 20 rear, with approx 700x35c tyres. Enough to get up fair hills but not spin out unless downhill with a tailwind. I live and used to ride it up and down the hills of Tynedale.
I now have an SLX chainset with only the large ring left on. I use a 3/32″ singlespeed chain for no particular reason, although IIRC Alfine kit is designed to work fine with 8 speed chains.
The peregrine has an EBB so no tensioner is needed.
You should not need a NW chain ring and you’re almost certianly get a longer life by using something cheap and steel for a chain ring.
Old Pic, might not work