The first photo is the small hangar bay, with some mechanics, a speeder, a tow thing( for tow pieces of ships, Doh!!). more for the end, we see that Bacta tank room ( some kind of medical center) and then we have the corridors with lots of droids arround, and the last room is the command center, with lots of stuff computers and... Ackbar?! what was I thinking... and there is a over view. the base is divided is 6 sections: three for the command center, two for the hangar and one for the bacta tank room.
About this creation
After their success against the Galactic Empire at Yavin 4, Rebel Alliance High Command sent many expedition teams across the galaxy to scout locations for a new base, realizing that Imperial retribution would come swiftly against their base on Yavin 4. While fleeing an Imperial pursuit squadron in 0 ABY, Luke Skywalker and Han Solo fled to the icy world of Hoth. Its remote location, protective asteroid belt and low likelihood of Imperial presence made it an ideal location for the new Alliance headquarters. After escaping simultaneous attacks by the bounty hunter Raskar and the smuggler Salmakk, Skywalker recommended the world to Alliance High Command, and the leaders agreed to his proposal.
The interior of Echo Base.Major Kem Monnon, head of the Alliance Corps of Engineers, was sold the location of a series of caves by an old smuggler. Monnon was then dispatched to Hoth to plan and oversee the construction of what would become Echo Base. Geothermal analysis indicated that the best location for the base was on the northern edge on the only livable temperate band near the equator. Monnon's engineers built the base under the mountains of the Clabburn Range south of the Nev Ice Flow and reinforced the natural ice caverns beneath the surface of Hoth to serve as pathways.
The Millennium Falcon receives repairs in the massive hangar of Echo Base.After two standard years, Echo Base was completed. Two large bay doors provided main entrances at the north and south ends of the mountain range. The hangar was one of the first segments built to allow for the steady inflow of resources. The facility included perimeter defense trenches, static anti-infantry and -vehicle emplacements, v-150 Planet Defender ion cannon, OrC-19 planetary com-scan unit, theater shield, medical facility and command center. At its height, the base housed 7,500 combat and command personnel, 350 medical personnel and 120 droids. The hangar was large enough to simultaneously house at least thirty GR-75 Medium Transports, sixty Rebel starfighters, twelve snowspeeders, the Millennium Falcon and Outrider.
The Alliance patrolled the terrain surrounding Echo Base with mounted tauntaun riders and snowspeeders, and regularly warded off wampa attacks. The perimeter of the base was dotted with scout posts labeled "Echo Stations", such as Echo Station 3-8, Echo Station 3-T-8 and Echo Station 5-7.