Metal buildings in Ark are a huge pain, which is why I wouldn't even bother until you have (A) an argent to fly you to and from the Volcano (B) 4-5 forges set up on the volcano + the crafting station to make walls/floors/etc. Your bird will be able to carry the manufactured goods in much higher quantities than it will the raw metal.
This is the fortress Brian and I built out over the lake. He had to take his frogs out to get cementing paste... *so much cementing paste*.
|Mid-way through construction before high platform or garden additions.|
|Crystal Lake is good for drop pods.|
|I made display ledges for Brian's trophies.|
|Custom banner (painting by Alex Grey).|
|Garden with irrigation on lower level. It was easy to run irrigation up from the lake through the pillars.|
|Landing pad - perfect for the birds.|
|This photo shows the completed fortress, with higher landing pad (for the quetzal - which also has a platform on its back).|