looking good!
i found the sabvoton case actually weighs around 2 kg, and the actual board inside and heatsink the fets are screwed to is only 1.2kg.
it would make sense to set the board up in the frame with heatsinks on the front of the bike save some weight, though the nyx is praps not really suited to that so well, unlike the vector for example.
oh, and if you havnt programmed it yet, switch"slide regen" to off. it basically means it auto brakes when the throttle is released. really annoying when testing on the stand as it makes a massive clunk! each time you release the throttle.
electric brake is what you want, ie. variable regen. very confusing.
and dont set speed limit type to "no limit" just leave it as "internal set"
it makes the wheel spin up to maximum with no way to stop as soon as its enabled
got one sabvoton boxed and ready to send back for repairs, but qs have already said its probably a write off.