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)