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)