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)