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)