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)