Im sorry you dont have it,so i love VR,i started 2 years ago searching and i started with cardboard vr,them i jump to vrbox,its a good try you can notice what 3D depth is capable,i played only 2 games on it and i was "WOOOW" the hair in front of face,the boobs,butt and all...but them since there i was amounting to get PSVR when it launched,i got and and its far beyound what you see,i went back to vrbox and notice the power of PSVR, you really have the feel of dimension and proportions,a real sense of scale,and i the vr box is like an wall 2m far your eyes and a screen right there only in 3D,on psvr you really is there seen it,its like your eyes on this new world.
So a first step is great: you developer with cardboard and later you can bring more,but i have other solution: ask for someone to help,i did a lot on unity days ago,but never did a game,only to learn,you can get easy OSVR plugins and integrate on unity,of course now you can get psvr too,i dont know how.
Them lets talk about what i tested: i used tridef3D and got 2 images (split screen) and put on trinus gyre psvr,it shows me a zoomed imagem (precisely the center of screen) i can see only until the 3rd button on character creation,and on left i can see a little of wall near her right arm (girl is in front of us),so my tip is: you really need to have VR to modifier the menu,im studing how solve it to see all,but you can simple put (finish button) on Enter button of keyboard or press Start on joystick,or move the button to near the character. So that was my problem i couldnt go beyond character customization.
I wish i could get and adjust for you on unity for VR,but i would simple get OSVR and try to adjust for PSVR as well as HTC VIVE and RIFT,but you have another great and simple solution: try to integrate with Steam VR,its all ready for it.
Another tip: you have unreal engine that have VR plugin too but i dont know much about it.