I actually found a vid on youtube with good form, lol.
This is actually a comparison of the barbell trajectory of romanians versus powercleans but the romanian part is the "classic" romanian at least as far as I've been able to tease out what classic is. It's really quick but if you watch real close you will see how it matches with the description I gave above and notice particularly that knee flexion does not change throughout.
I do want to note that if you try to mimic his depth and you don't have the ROM your lower back will round out and you will no longer be doing a Romanian (or anything good, imo). It doesn't matter if you stop just below your knees or lower or even if you can reach the floor as much as it matters you do it right. ROM can be improved but an injured back is much harder to fix.