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)