I started piloting Nexus Kate recently, largely prompted by CtM, the main differences in my build being:
1) Relying more on breakers with Nexus as later efficient backup (paid influence for corroder/shrike/mimic, dropped to 1 copy of Nexus, but with Artist Colonies + Fan Sites, and an Akamatsu Mem Chip.) This is probably a mistake, but I haven't become comfortable relying on Nexus early simply because of the install cost, which can be such a huge tempo hit. On the other hand, it lets you facecheck ice painlessly which can slow the corp down a lot, too.
2) Sure Gamble over Modded. Especially with Kate giving a 1c discount, the only real targets I had were RDI, Opus, Nexus, and Shrike. Shrike is usually installed via SMC, Nexus is often installed via AC, and Opus is installed only once. I'm thinking of replacing this with Dirty Laundry or Underworld Contacts so it's not bad post-Opus. I do like my relatively low reliance on resources versus the popular All-Seeing I (mostly Beth/AC), though, so we'll see.
3) No NACH (I do have FC though, so this would be a trivial change)
4) 1 Temujin Contract. With AC + FS, I can fetch Temujin if I'm poor, have an explosive start if it's in my opening hand, or just get an R&D discount for several turns. It of course shines against asset spam, and is completely nuts in general.
Changes I'll make now: Drop Mimic (it feels bad playing this when I also have Shrike,) add NACH, drop my 1 Patron I was testing (Earthrise is just miles better), and either drop 1 CC & add Vamp or add Employee Strike. (I'm at 46 cards with 1 Freedom Through Equality.) Edit: And switch Sure Gamble -> Dirty Laundry.
I have little doubt your version is stronger (I don't have much experience with the deck and I'm no pro) so I could just copy it, but I think learning my flaws by experience will be a more rewarding teacher. That being said, I'll be keeping your version (and its reasoning) in mind as I tweak mine.