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)