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)