Sorry you're not getting feedback. Mind clarifying a few points?
- What's the overall goal with this? Is is for FM drones and harmonies, or is this a rhythm instrument, or supposed to be an all-in-one type of instrument?
- You say you have a keystep pro. Do you have any other outboard gear you're using with this?
- How much of this do you already own, versus just planning to get? Do have a case yet?
Admittedly, I'm not personnaly familiar with most of your modules, and I'm overall entirely confused by the Tukra, so my feedback is only general. However, I'm not seeing much in the way of modulators and core utilities (vcas, LFOs, attenuators, inverters, offsets, etc...). Maybe your modules can cover some of these functions (the Tukra looks like it might be able to do some of this). However, utilities are the glue that actually tie the big-ticket items together into a singular instrument and shouldn't be overlooked. If you do have hp to spare, I think it might behoove you to add some. The ones I mentioned above should be the main focus, but there are plenty of interesting circuits out there that can add surprising magic to your patching (I simply adore comparators and sample and holds). However, like I said, I'm not overly familiar with this suite of modules, so maybe I'm not seeing some functionality.
Maybe others who know these modules better can add on. Good luck with your modular journey!