Here's a quick model of the Lab we're working on at the moment, there's no texturing in it and not all models are finalised... we're just having fun with the layout. Only the top half is populated at the moment, the bottom is going to have some sort of shape to it, and include a spiral staircase to the surface. I think the plan is to put a bit more character and style into the shape of the environment, think Monkey Island.
In other news, after taking on board the feedback, I made a second Time Machine design for your consideration... at first I preferred the hulking big one, but the new sleek one is growing on me. What do you think?