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)