well Dave, my husband is 6' 7" tall (exactly 2 meters which is a shade below 6' 7")...
and he has trouble clearing just about everything...
being only 5' 4" tall i tend to forget about things like that...
(i once found my dream house...was already to sign on the dotted line, when hubby took a stroll through and nearly was decapitated.....the family selling were exceptionally short, so when the marble floor they put in raised the normal floor height by 2 inches, they didn't need to change the doorframes.....hubby had to been completely bend over to get through them......i doubled over laughing.....and of course, didn't get to buy my dream house...)
by the way, my 14 year old son is only 190 cm, so the doors shouldn't be a problem....just the pull down bunk.....we could cut off his legs......or his head.....or make him sleep in the fetal position....
or get them a separate room....which is what i'll do if they decide to go despite the smoke...