Had a lot of success today with ripping down the ships, many thanks!
I've a newer build up if anyone is interested;
Roketz WebGL Alpha_06_10_2015
Not much has changed other than testing out the other 2 ships and you can now fly the second ship (using W/S/A/D and left shift). The camera also tries to keep both players in view rather than split screen - though I will probably have to ditch this as some levels are too large (airduct for example).