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)