All I need now is a dungeon. So based on some advice from the ever creative Harry from Lead Adventure and a quick glance at Stuart Bannister's great tutorial, I've started work:
Some basic planning should - in theory - make the process easier.
Rock from the garden for texture.
Checking different base sizes. Looks OK! Also, a bonus goblin fanatic I found.
First room and a couple of corridors.
Proof of concept seems sound; so I'll make the basic shapes and then paint some.