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)