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)