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)