It can be done... depends on a room - do you have some transportable acoustic panels - to dampen reflections a little if it won't be nice sounding?
Your equipment is cool.
1. I would tempt you to record everything with JUST the two earthworx mics - position musicians so the natural balance will occur and record that... Through the best pres you have...
Otherwise - you will be probably short of some mics for the whole lot...
2. Maybe add a kick mic (you know which
) and a snare mic (57) for some definition and put one of the 57s on double bass to catch some more pick definition (the natural sound of double bass should be recorded with the ambient earthworks') - or if he has a good pick-up - try to record also that signal - might come in handy... And use the ribbons for the piano... MS stereo maybe?
I wouldn't sacrifice the ambient pair - but you might miss the overheads for the drums - so maybe put the ambient pair nearer to the drums - but so they still catch some double bass and piano which will be miced additionally... Sensible?
Can FF400 preamps handle the ribbons? I would use SSL for drum mics and ambient pair, focusrite for the SM57 on double bass, FF400 preamps for Ribbons on a piano if they are clean enough and have enough gain... If Earthworx are as good as they advertise them, then you should make some nice recordings...
best