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)