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)