I have similar set up as
@benor83, I extend the length from behind instead of in front by adding a nut and few washer then removed the vertical aluminium bar to fit my zotac gtx 1080 mini. Initially, was buying a30 from a seller but I received a31 instead which not fit my gpu and need a bit of modding. I actually end up did not screw few of the place like:
1. motherboard only screw 3 out of 4
2. standoff for pcie riser 0 out of 2 because i use diff pcie riser from geeek which i recommed to get from geeek to avoid compatibility issue
3. vertical bar I didn't use any but i can actually use 1 on the cpu side, didn't use it on cpu side due to only realize it half way building and i just continue to see if it stable after complete
4. the panel that mount drive and the bottom standoff, i screw 2 out of 3 due to not using vertical bar on gpu side.
Overall the build is still stable and okay even without some of the screw expect that i not comfortable with the gpu due to it's only secure by one tiny panel at the back of the port and not screw with the standoff.
@pwneta as for your question, YES it will support 200mm GPU if you removed the vertical bar and it doesn't affect the build stability after you mount all the panel.
I just measured the thickness of the bar is approximately 12 - 13mm.
It could even probably support my zotac gpu without modding if I removed the vertical bar and removed the GPU shroud and doesn't care of the aesthetic
Hope this helps and doesn't know if you can view the image from the link i post
I was searching on how other manage the cable on a31