I’d be a little concerned about the crossfader, since the infiniumis already out of production as far as I can tell adn the new one has a slightly different throw and might not be a drop-in replacement (I saw somewhere an official statement from Elektron that the MKII crossfader is a MM or two shorter throw - not enough to make a playability difference but suggests that the form factor of the part could be incompatible with the MKI without some kind of modification) but only in the (very) long run since it sems to be a really robust part.
I’ve had some pretty harrowing experiences trying to source faders for vintage gear before though, minor changes in form factor can cause major hassles (try replacing a fader in a Juno 6 today).