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)