I don't get why so few people mix mdf with 3dprint bits.
These complmet each other perfectly. MDF is great for quick and cheap large pieces of terrain, 3d bits are great for breaking the flats and detailing it to a decent level.
Even if you dont want to get into 3d printing yourself, you can get some cheapo online printing service that for 25 usd will print you enough grates, keypads and fuseboxes to pimp up dozen tables. Hell, if you know a guy with a printer he might do it for a beer - shits so small and low profile its extremely quick and cheap to print and finish.