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)