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)