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)