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)