Just finished cutting this out on Saturday and took it flying with me today. I cut out the pluck foam to the needed depth and then used Plasti Dip to spray the foam so it holds together and is slightly rigid.
I was not interested in anything to fancy, just wanted a fairly cheap hard case...
I can tell you that the POWER A Storage Case for PSVR - PlayStation 4 from Amazon does NOT fit the DJI Goggles. DJI Goggles are too big for this case.
Amazon.com: POWER A Storage Case for PSVR - PlayStation 4: Video Games