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)