I've been intending to do the same with their Mudi (E750) and between not feeling comfortable trusting their builds and being unable to get my own working (upstream openwrt has stability issues and I guess they have some patches to make the modems work properly; still haven't been able to get a properly working image from working through their repos yet).
It's quite frustrating as it's ideal on paper but they fall on the last mile to make it practically open.
