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)