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)