There was a thread about that somewhere on this forum, but I just can't find it, so I decided to start a new one. Dannian asked me about mixing machines with other weapons than original. So, here is a little instruction for everybody

You can't produce machines with mixed weapons, but you can create them on the map. From the beginning or by adding them with a timer.
In the section 'Machines' of the *.scn files in the data folder you just have to add a new verse, for example:
AGGRESSOR 3 1 744.764 1245.59 -0.065 ASSASSIN LR_MULTI_LAUNCHER2_X2
It means that on the coordinates of 744.764(X) 1245.59(Y) there will be a reaper with knight's weapons.
As far as timer is concerned you have to add verses in the actions and conditions sections, for example:
CONDITIONS
TIMER reinforcements1 100
TIMER reinforcements2 300
ENDCONDITIONS
ACTIONS
REINFORCEMENTS ON reinforcements1 RACE RED DISABLED
MACHINE CONSTRUCTOR 1 DOZER
MACHINE CONSTRUCTOR 1 DOZER
MACHINE AGGRESSOR 2 ASSASSIN L_PLASMA_RIFLE
MACHINE AGGRESSOR 2 ASSASSIN L_PULSE_RIFLE
MACHINE AGGRESSOR 3 GRUNT LR_HEAVY_BOLTER1_X2
MACHINE AGGRESSOR 3 GRUNT LR_HEAVY_BOLTER1_X2
POINT 297 1500
END
REINFORCEMENTS ON reinforcements2 RACE RED DISABLED
MACHINE AGGRESSOR 2 GRUNT L_FLAME_THROWER2
MACHINE AGGRESSOR 2 GRUNT L_FLAME_THROWER2
MACHINE AGGRESSOR 2 GRUNT L_FLAME_THROWER2
MACHINE AGGRESSOR 3 ASSASSIN LR_PLASMA_RIFLE_X2
MACHINE AGGRESSOR 3 ASSASSIN L_PULSE_RIFLE_R_SUPERCHARGE_ADVANCED
POINT 297 1500
END
ENDACTIONS
And so on the coordinates of 297(X) and 1500(Y) there will appear some units after 100 and 300 seconds, among with a reaper with a commander's pulse rifle and a reaper with a commander's pulse rifle and a commander's healing weapon.
BUT you have to remember that you can't mix all weapons with every machine!
Hope I cleared it out, take care.