upsides to making a portal to heaven  
    to  build   the  factory   there    
  
                                          
 first  of  all, real  estate: the highly 
 fractalized  geometry  (not  proven  but 
 likely  to  be the case)  implies almost 
 unlimited room; even  if the portal tech 
 would  be  stolen,  chances  of  running 
 into  a  competitor is  close  to  none, 
                                          
 secondly,  the  resources:  heavens  own 
 alchemical  properties  (proof   exist!) 
 makes  most  base materials  easily  and 
 readily  available. once  the  molecular 
 movement  patterns  are mapped  out, any 
 compound   can   be   created  virtually 
 without                            cost. 
                                          
                                          
  
  downsides  to  making  a  portal to   
   heaven to build the factory  there   
  
                                          
 current portal  tech  takes some  energy 
 to hold  open, which  isn't a problem in 
 itself.  test results however  has shown 
 that without an active tether,  heaven's 
 time flow breaks down  completely.  even 
 a momentary fluctuation  of  the  portal 
 would   render    all    remote   assets 
 practically  lost.  much  care  must  be 
 taken   to  maintain  portal  stability. 
 (one option could  be  several  portals)