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)