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)