txAlfa - I've just done a quick "feel test" - it appears that the screen & dvd player take up close to half of the headrest width towards the top were the grab bars get inserted (remember I'm working with the 7", not the 9" as was the original intention). I'll need to actually cut into them to determine how much space is really available; if it's too tight, I'll simply cut away at the top of the grab bars - weakening the bars themselves, but based on how their constructed, they're just wedged into a receptor in the OEM headrests, not bolted (the bolt is into the seat back, which will remain) - again, actual pictures will make this a bit more obvious....
I had also considered fabricating a bar that runs inside the headrest and joins the grab handles, but I think that this might pose a safety issue in an accident, in that there wouldn't be enough padding between the occupants head and the bar due to the space required for the DVD player/LCD mechanism.
I did note that a few users in the UK have cut the top support from the grab handles and claim that they still function properly as handles; I'm not sure I'd want a full size adult using them to help themselves into the vehicle, but it should be fine for kids.
