Hi Kev & Elaine,
Sorry can't help on this one,  but until someone that has bought a penthouse goes out and measures and looks at all these things I think we are all going to have to hang fire.  I would love to know all these things too and it is very frustrating that we can't plan or buy things for fear of the unknown. 
Sorry couldn't help you
Alison  
                                            
 
                                            
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 Always look on the bright side of life
  
Dogs have lots of friends cause they wag their tails and not their tongues
Alibabe
                                            
                                            
                                            
                                                
                                                    
                                                    
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