Elsmore,
That stand looks brilliant, a fantastic idea to base them all like a diorama, It will take a long while to build the army but will be well worth it if they all come out like that.
I feel your pain on the symbols

Its a nighmare to get consistancy, Especially in white as you need it to be thicker to cover the blue, you may be right about thining the paint, There must be something on the market,
Have thought about trying a stamp i.e like the old potato print things you used to used at shool, if you cut a U shape in say cork, soft wood, rubber etc and use it to print, But have not tried it..... would be very hard in 6mm and would require the stamp to be cleaned afte reach operation due to paint build up but may work..
As for any other colour i use Fine tipped marker pens like the ones you write on blank discs etc and have had great results, but they dont do white so its does not help you
Keep up the great work regards epic