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)