you can still spray paint part by part, it's like airbrush except that you are using spraycans 
use these to hold the parts when spraying them


then poke them into a foam to let the paint dry

Some hobby shop have sold this in sets, you can make yourself with a stick and alligator clip or paper clip from hardware / art stores.

For me i spray facing the windows so the fumes will come out as you spray in a box with a fan at the back to suck fumes out. Unless you get close with the wall with an airbrush it won't hit it as paint will evaporate over distance for normal spray cans is possible since it range is much more larger. 

You can refer to tytroum to get a set in the lyn street mart sale section.

Marker is much more time consuming as it not easy to get a nice finish on large parts without going painting the part multiple times to avoid the brush strokes.

i'd like to ask what are the steps to achieving such a finish for the red