Somewhere under all that dust is a shop vac...
One of the things I do, and strongly recomend, is to use sheetrock bags in your shop vac(especially for fine particulates like MDF dust). Best I remember they are about $10 for 2, but well worth it IMHO.
I also like to hook my shopvac to my router. It can be a little cumbersome and not quite the 5HP Cyclone dust collector I long for, but it is fairly effective at maintaining minimal piles of dust. I also like to run a shop style air purifier(I got lucky and found mine on clearance at HD a few years ago).
An older one of these...Delta
Throw a $10 tarp(or some of that painters plastic) over your car, before you start in the evenings. That should cut down on most of the dust, and your clearcoat will thank you for it later. You may want to have a look at your cars airfilter too...lol
I really hope you are wearing a dust mask(MDF dust is toxic).
Ear protection is also a plus, wouldn't want to do all that work and not be able to hear the fine details.
OK....I am going to get off of my soapbox now.....lol
Jeez, sometimes I sound like my mom...
BTW, Superb job on those braces!