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)