I doubt if its possible to get ship with parts inside 

I tried in Enc 1 galaxy missions. I captured ~40 fleets and all empty 

But most of them explode, so even if you capture that ship it will explode or it will be empty 

I met once Space main but it was with big ship, so it got pwned 

Too bad that all those ships are full of marines, that would be a cool way to make money...
Check this one 

Fleet Name Ridiculous ☺ 1   Numbers in
Fleet   Space/Ship   Marines   Space
Left   Energy
left   Sell Ship(s) + Upgrades
   0    1000    0   997   999999998     
 Attack   Defence   Hitpoints   Crew Level
   104940         9060000000000         11298084000000         Rookie   
Attack accuracy   Absorb Power   SP Power   AP Power
   85 %          0%          00%          00%    
Installed ship systems:  
POWERCORE systems: 
   Name   Weight   Sell Price   Energy
Gen    Sell
   RD Powercore   1   1.250.103.000   1000000000    
SPECIAL systems: 
   Name   Weight   Sell Price   Energy
Req    Sell
   RD Special   1   2.314.553.001.521.500   1    
WEAPON systems: 
   Name   Weight   Sell Price   Energy
Req    Sell
   RD Puncher   1   5.629.499.539.816.270   1