Thanks man. I can tick a couple of things of the list then!
So, I'll go with a 600 lph canister, probably the Tetratec as it's a fair bit cheaper than the Eheim but I've heard good things.
I've posted a Q about lighting, but some initial calculations suggest that the stock "Intelligent Light" should be OK for the low light range of 15 to 30 lumens at the substrate.
Need to look at how I'm going to plumb the canister into 2 bulkheads, and importantly, where I'm going to place the bulkheads. I'm thinking about 3 inches below the water line.