My cousin, who was responsible for getting me into 40k many years ago, has a Kickstarter up for a business he's starting making 10mm/12mm terrain (Heavy Gear, DZC, etc). He's got an art background and has really done some great designs. The terrain will be cast resin, but he's got some tricks to keep the weight down. The KS is funded, so if you have a want for that scale terrain, check it out.

https://www.kickstarter.com/projects...10mm-12mm-scal