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)