What corner bracing is used with these? The corner bracing on the website looks to be for regular tongue and grove and not the hybrid.

We do not currently have a quick clamp design to go with our E0826-2M hybrid style extrusion. 

If you decide to use our E0826-2M and E0876-2M combination and do the traditional miter cut to bring them together at the corner of the case then our B1123 corner clamp will cover the join perfectly. It is designed to have an offset to sit over both E0826 and E0876 - see the link here: https://www.penn-elcom.com/us/6-hole-brace-with-offset-2in-x-1-7-8in-b1123

If you prefer to use our quick clamp design that eliminates the miter cut, then at this time you would need to use our FW18 and FW18B but use the tongue and groove design over the hybrid design.

I hope this helps, feel free to reach out of you have other questions