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)