Battlestation: First Contact episode 5 tips and advice

Wow,I actually beat it on my first try. (But have played the other episodes a lot)
70 engineers, all 10 scientists on energy research. Built 8 bolters and then up to 5 missile ships. Replaced bolters with orbs when i had a lot of money and could not build more ships. Then finally replaced all with plasma when i got them and won at lvl 83. Bought some more ships at the end too, as I lost some while focusing on capital ship with the plasmas.
Bug: I have best episode 0 even though I nailed it on my first try.