The big issue I see is Inazuma. It’s an amazing card, but with three of them, that actually leaves you with 19 Ice insofar as NEXT’s ability is concerned. So only having 2 is likely, but only having 1 is also very possible, as Inazuma’s a useless card to NEXT out, since you won’t have the cards to make any of your centrals a trap. I considered it for a while, myself, but for all that it’s amazing, I don’t think positional Ice is the right call in NEXT Design, certainly not as a 3-of with only 22 Ice in the first place. I know you say it’s not a big deal, but it was an irritant for me in a 27-Ice deck, so with 5 less… I don’t think it’s the right call at that level of consistency.
I have loved having Tollbooth in NEXT, myself, but I’m a big fan of it in general. If you swap out Inazuma, I’d definitely consider popping one in at the Ichi 2.0 slot. That said, my NEXT Deck has been rather Ice-intensive, with the idea being to create safe opportunities to use ABT almost always. That hasn’t been working perfectly.
You’ve got no Econ Ice, which I think might be a mistake. Caduceus is good, though you’re sentry-heavy. Shadow is worse, because while you can advance it out of Mimic range you don’t have any benefit from tags (maybe Bad Times, when Upstalk is out?). Pop-Up Window doesn’t ETR which makes it a nuisance for your first turn, and expensive to place into a tower later, but it’s money. Having something there that’ll make you a bit of cash your first turn and recoup rez cost seems worthwhile, to me. Your econ does seem plenty strong without it, but if there’s a way to squeeze it in, it might really help you out some.
Looking forward to Upstalk, I might consider a Mother Goddess even without NEXT Silver, for the opportunity of a 4-strength typeless ETR your first turn, possibly to cover a scoring server or R&D. I think it might merit more of an inclusion than Bastion, for all that it does very different things.
I’m curious about the decision for ManUp. It’s doable, and it’s certainly good to have, but with all your Agendas taking 4+ points, you’re not going to be able to score any from hand with just one, which is the advantage ManUp provides ABT and Vitruvius. I also find Vitruvius helpful for recursion, as I said, and might propose one instead of at least one of the ManUps, since you’ve got Fast Track to find them. Not certain on that, of course, but you’ve got a tough road to plow to score any of those Agendas all that easily.
EDIT: To go more into the issue with Inazuma, you say it yourself, you have 9 Ice that aren’t ideal for Turn Zero. Ichi 1.0’s certainly not the worst, but barring an economic windfall, Ichi 2.0 is probably not getting rezzed first-turn either, especially if you’re hoping to start scoring an agenda quickly. So that’s more like 6~ Ice that doesn’t “count” when considering useful openings, which is a full quarter of your Ice package.