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)