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)