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)