I will get a sketch up at some point tomorrow to help explain this better. But here's an idea that's essentially a modification of the triangle map I was making. The corridors leading from the red/blue rooms leading to the gold room could be built in such a way, so that they would take you to the upper level of the Gold Room when orginally you were on the ground floor of the other rooms, a pair of ramps can then take you down to the ground floor and towards a central Atrium. The Red and Blue rooms themselves would be connected via their upper levels by a corridor that would branch down to a central point that would link to the central atriums lower floor. The central atrium would have a catwalk that would connect all 3 rooms. But would also have a large lower level with a pit, with the catwalk overlooking it, a man cannon could be used to get to the catwalk by placing it near the connection between the Red/Blue Corridor and the CA. Sorry if you don't have any idea what Im talking about, as soon as I can I will get a sketch up tomorrow it's late over here.
Ok, heres the quick sketch: Arrows indicate direction of upwards incline. Circles indicate power weapons A square with a triangle inside indicates the man cannon. White areas indicate the lower levels of a map. Shaded in areas indicate upper levels. Very darkly shaded areas indicate walls or parts that are not actually part of the map.