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)