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)