Ok since I just finished my new steam boiler today, I figured I should participate in this thread by showing off my new base that I've been building the last few days.
First, it all starts out at a remote oil well. I'll find a fresh oil well in the desert, and build a platform above it like this:
It has a mini Logistics Pipes network which tries to keep an empty bucket in the Liquid Transposer. The Liquid Transposer takes oil from the Pump and puts it in a bucket, then sticks that bucket of oil in the Ender Chest.
A World Anchor keeps the whole thing going when I'm away.
A Redstone Power Cell set to 1MJ/t keeps the Logi network running in addition to the Pump.
Next, back home in my basement, I have a big 5x5x5 oil tank that holds 2000 buckets. The filling is performed by this setup:
Its got another mini Logistics Pipes network, only this one tries to keep a bucket of oil in the Liquid Transposer.
That empties the bucket of oil and pipes it into the tank. The empty bucket then goes back in the Ender Chest, at which point the oil well picks it up and fills it again, and repeats until the oil well is empty.
Next, the oil is pumped out of the big tank, and into a Refinery that sits beneath the floor. This then pumps the resulting fuel into the massive 7x7x7 fuel tank that holds 5488 buckets.
I've left the floor uncovered to show you where things are routed.
The fuel is then pumped out of the fuel tank, and under the floor again and into the Steam Boiler. This is a High Pressure boiler, that has 9 liquid fireboxes and 36 high-pressure boiler cubes.
It produces enough steam to run 18 Industrial Steam Engines which are stuck to all four sides of the boiler. There are only 6 levers which activate the engines.
These all feed into the central energy network that has 16 Energy Cell charging spots, and also powers various Buildcraft devices in the base.
Here is the boiler viewed from the other side.
Notice the energy conduit running up into the ceiling and forming a charging station.
This feeds power into the mid level of the base, where most of the crafting takes place.
Up here, you can see the majority of the crafting area. It has the walls of barrels containing base ingredients, as well as a complete IC2 power station and core machine setup. There is also a UU-Matter production line here.
Here's a close up view of the IC2 station. You can see the Nuke, which has 3 reactor chambers attached to it and produces 160EU/t when switched on.
The output goes to the MFSU on the right, and the Mass Fabricator on the left. The Fab does not drain from the MFSU, which is intentional.
On the right, there are the four base machines (Induction Furnace, Rotary Macerator, Singularity Compressor, Centrifuge Extractor) which face the crafting area.
On the back side of those is an array of four Recyclers, each with 5 Overclocker Upgrades in them.
The Logistics Pipes network here tries to fill the Recyclers with Cobblestone, and provides Scrap out of the sides.
On the left, the Logi pipes try to put Scrap in the bottom of the Mass Fabricator, and UU-Matter into the chest.
Above the Nuke area, the Logi pipes then go to the top level of the base, where they pull Cobblestone from an array of Barrels along the wall. The chest in the middle holds Scrap as a buffer, from the Recyclers.
This means I can dump huge amounts of Cobble into the row of barrels from remote Quarries. I haven't set up an Ender Chest system for that yet but its on the list of things to do.
Lastly, here is my main crafting area, where all the important stuff is stored, with the main idea being easy access to the central crafting table.
Note the use of Wrath Lamps throughout the base, as well as Sandstone floors, which have a high reflective rating, making everything bright and preventing mob spawning with a minimal number of lights.
That's pretty much it so far. The top level has an enchanting area, and access to the roof via steel door and obsidian pressure plate.
There is also an array of solar panels on the roof connected to the MFSU via tin cable along the side of the building. This provides the EU necessary to run the four advanced IC2 machines at idle without draining the MFSU.
It may seem strange given the presence of a Nuke, but this is important because with the World Anchor, those four machines running at idle will drain a fully charged MFSU in only 13 hours and 53 minutes.
Here's what the base looks like from above.