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)