It's time to start a massive basing project (80+ figures for the first round, plus another 40+ if I like the outcome) and I want to set myself up for fast, productive workflow, maybe doing models in groups of 20 in just a few steps each. My theme is sort of aged urban devastation... a cityscape laid to ruin in a battle months or years earlier, so crumbling pavement, gravel, and sand, rusting sheet metal and wire, pools of filthy water, shattered masonry, dead leaves and paper trash, tufts of hardy brown grasses and weeds pushing up despite the toxic residue, all in shades of soot, ash, rust, and dust.
I know I'll need sand and gravel, but I'm not sure what scale/grit/grain... PVA glue is on the list, but should I try to tint it with paint or dye? Will I need tons of paint or wash to ink and drybrush the texture, or can I get the materials themselves to bring most of the color? I also need props... I have saved lots of scrap plasticard and sprue, but I need static grass, little glue-on tufts, barbed wire, maybe other neat bits if it can be done cheaply.
Any guidance on what I need and how much of it, and most importantly, who to go through for good selection and cheap, fast service? Thanks!
Here's a great example of "the look" I'm after:
http://www.spikeybits.com/2016/04/fallout-40k-new-california-republic-admech-army.html