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)