WETTI M4 Project Questions

[surebet]

Greetings,

I'm doing a last bit of research before comitting to the WETTI platform. As you read this, know that I'm also looking for answers, but if you have stuff to ponder I'd appreciate it.

First block
What type of front ends are compatible with WE M4s?
I've been steared to a KJW but I'm more familiar with the WE system. What are the compatibility issues, how can they be bypassed?

PMAGs
I've seen WA based PMAGS converted, anything similar exist for WE?

Out of the box issues
I know I'll need an NPAS and better charging handle. Apart from usual GBB consumables, do I need anything else?

Optics
I know vibration kills cheap ACM optics, any repro items able to take the added stress or is it RS optics only?