Ok, i know a few people who use scmdraft for terrain, but who could REALLY save some time just using Sf custom Brushes!
1. Open Starforge, and go to New and make the map demisions 128 x 128, zero clutter, and asphalt as your default terrain [Screen Below]

2. Next Go to Terrain Layer, and hit Pallete.. which should bring up the master tile pallate [Screen Below]

3. Finally, go to Custom.. and get your Custom Brushes Pulled Up [Screen Below]

4. Now you can change between your master pallate and your custom brushes. You can make different things using custom brushes [Screen Below]

I have attached and example Starfirge Custom Brush, use it with the JUNGLE tileset, it does need some belending though...
HAPPY TERRAINING!!
~Torry
Addition: WHOoPEs cant upload that kind of file, if you want it pm me and ill email you