I don´t want to be cruel with the truth,- but the layout of the forum is one of the strangest things i´ve seen since last 25 years!
In Germoney we say: " No need, to invent a new wheel" ... Did You know what I mean?
It is just my two Cents... Take a standard BBoard with all the included functions... nothing else to do.
BTW.: You are working on new "features" at the viewer since April? Both my browsers ( Firefox / Chrome ) the background behind my parts is flickering!?
Nevertheless... Sketchfab is my favourite viewer.