Hi,
Yes the roof is for head height.
I did build the rig ..... it is my pride & joy
PS besides two slide-outs .... the rig now has a "slide-On"
Just completed a "Slide-On" locker for the CT. (I was missing that second locker

)
When on the road the locker is stowed in the CT, within the upper bedding area.
On site the slide-outs are errected and the Slide-On locker is placed in position, over a 'V' bracket (similar to a flat wall LCD mounting bracket).
The locker only holds kitchen items .... so it is light.