I took the "Old Fishing Store" Ideas set number 21310 and turned back the clock on it from a rundown fishing shop in the modern era to a modular 1920's supply depot for Johnny Thunder and his friends, also known as the Adventurers. I added a set 7596-style freight Crane that's a part of "Trash Compacter Escape" (a Toy Story 3 set).
I revised the color scheme of the mainly dark bluish gray building instead of the original sand green, and removed a ton of the mixed bunch of colors that were used a "patch jobs" on the dock and building proper. I removed the roof and redid it completely to be brick-built with slopes instead of plates and tiles at an certain angle. I also stripped the many windows styles off and replaced them with a single type. I added a warehouse section to the lower floor by sending one of the walls about 16 studs back, allowing for storage space for various equipment not yet designed.
The back wall of the building shows off the new wall art placed on the roof section of the building: a giant propeller from a ship of some kind. The large billboard is double-sided, and says "LEGO" on both sides. It gives the dock a gritty, downtown, waterfront industrial feel, at least to me.
The back wall still opens in two sections, but the inside is a rough estimate. Some parts I already have from my previous depot model from almost 1 1/2 years ago, such as the safe, radio and various maps. Also, the two freight loading doors actually open and shut quite nicely.
The model comes apart into four sections, with the main roof, tower, tower roof, and main building + dock all separating from each other.
The crane was totally copied from my previous depot model, which itself was duplicated and color-changed from the dark green / white one in the Toys Story 3 set I mentioned earlier.