Summary

smartphone HMD designed to be further from the face 7" and not requiring lenses. made for programming and movies.

untested/unprinted concept other than trying the proper distance without the printed parts. would call it better than google cardboard but the pla fumes might burn the eyes. could coat the inside with paper to help adding more air holes might be good option too. maybe there is a good paint for things like this.

set text to smallest with apps like icode go or other programming ide's for android. and have no issues reading it in bed.

https://play.google.com/store/apps/details?id=com.dztall.ccr.android

https://www.thingiverse.com/thing:93460 original thing but you wont need extra parts from it.

https://www.thingiverse.com/thing:4291975 found another thing like it simpler to print. maybe a hat conversion for a 3" beak can add 4 more inch.