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)